Quantification of Metal Artefacts from Orthodontic Brackets in CT Images: A Modified Method

@#Any metallic object within the CT scanning field can produce metal artefacts, which will degrade the diagnostic image quality. Previous methods described for quantifying this kind of artefacts were complicated and difficult to reproduce. The purpose of this study was to introduce a new rapid method for quantifying the artefacts produced in craniofacial CT images. This is an in-vitro experimental study. Four different compositions of orthodontic brackets were bonded consecutively in the tooth surfaces of a cadaveric skull head. All scans were performed by a single operator using the same CT machine followed by a standard scanning protocol. Artefact intensity for all data sets was quantified by following a modified method with a freely available open-source software ImageJ. All datasets were duplicated where metal artefacts were quantified according to the previous conventional method. Statistical analysis included independent samples t-test for validation and intraclass correlation coefficient (ICC) with a 95% confidence interval for both intra- and inter-examiner reliability. The modified method of measuring artefact score exhibited excellent intra (0.997–0.941) and inter-rater (0.996–0.905) reliability. In addition, no significant difference (p = 0.072) of mean artefact score was noted between the groups measured by the modified method and the conventional method. This modified method for measuring the artefact intensity is valid and reliable.

Multislice computed tomography/contrast-enhanced ultrasound image fusion as a tool for evaluating unclear renal cysts

Ultrasonography is a generally accepted imaging technique for diagnosing and monitoring cystic renal lesions. The widely used Bosniak classification (I-IV) categorizes renal cystic lesions into five distinctive groups according to ultrasonography and computed tomography (CT) image criteria. For solid renal lesions, determination of vascularity is discriminatory for malignancy in most instances. In indeterminate cases, contrast-enhanced ultrasound (CEUS) and magnetic resonance imaging/CT-ultrasound image fusion are able to detect and characterize difficult pathologies, with superior performance to either technique alone. In contrast to multislice CT (MS-CT), ultrasound image fusion is a real-time imaging technique that can be used in combination with other cross-sectional imaging modalities. This technical note describes state-of-the-art image fusion of CEUS and MS-CT to detect and characterize unclear renal pathologies.

Recognition of a rare intrathoracic rib with computed tomography: a case report / 대한해부학회지

One of the uncommon congenital variations is intrathoracic rib which a normal, a bifid, or an accessory rib lies within the thoracic cavity that is founded accidentally. Clinically, in most cases they are without symptoms; however, it may cause intrathoracic problems therefore it is important for radiologists and physicians to identify to prevent of excessive intervention and treatment during imaging diagnostic techniques of thoracic problems. In this report, we provide the case of a rare presentation of an intrathoracic rib in a 3-year-old boy arising from the inferior portion of a second rib based on findings from computed tomography. To our knowledge, this is only the second reported case of this type of intrathoracic rib that demonstrated with computed tomography.

Multilayer spiral CT volumetric representation and surface reconstruction diagnosis frame and the clinical value of rib cartilage minor fractures / 中国综合临床

Objective To explore the multislice CT (MSCT) volumetric representation (VR), curved surface reconstruction (CPR) in diagnosis of ribs and rib cartilage of the clinical value of minor fractures.Methods The X-ray films,axial CT,VR,CPR image performance of 112 cases of clinical suspected ribs and costal cartilage minor fractures were retrospective analyzed.The sensitivity, specificity, positive rate and accuracy,negative rate,missed diagnosis and misdiagnosis rate and the diagnostic value in the diagnosis of rib and rib cartilage minor fractures of four examination method were compared and analyzed.Results VR, CPR examination can clearly display the ribs and rib cartilage minor fractures, the diagnostic sensitivity (94.25％, 98.85％), specificity (88.00％, 96.00％), positive rate (96.47％, 98.85 ％) and accuracy (92.85％, 98.21％) of VR and CPR were higher than X-ray and axial CT examination(82.14％ and 88.51％ ,80.00％ and 84.00％, 94.50％ and 96.25％,82.14％ and 87.50％).And the diagnostic value of CPR inspection(the area under the curve) was 0.974, obviously higher than that of X ray film, axial CT, VR, and the difference was statistically significant (0.814,0.863,0.911;P＜0.05).Conclusion MSCT of VR and CPR examination in the diagnosis of rib in minor fractures and rib cartilage has very important clinical value.

A comparative study for the effectiveness of the image by multiphase CT enterography among three scan phases / 天津医药

Objective To evaluate the influence of the CT enterography (CTE) in different scan phases of small intesti?nal wall and arteriovenous vessels, and to confirm the diagnostic efficiency thereof. Methods A total of 286 patients under?went CTE were collected, and their CT image of three scan phases, including 20 s, 40 s and 60 s after injection, were record?ed. Values of reinforcement of the intestinal wall and arteriovenous enhancing degree in all phases were collected. A statisti?cal analysis was used to confirm the best phase for showing the structure. The diagnostic efficiency of the best phase of CT image was evaluated for the clinical diagnosis of small intestine and vascular lesions. Results (1) The CT value of the small intestinal wall in the intestinal phase was significantly higher than other two phases (Pintestinal phase, and there is no statistical difference between the intestinal phase and oth?er two phases. The result of CT value of ileum vein showed that intestinal phase>portal phase>arterial phase (P<0.05). (3) The sensitivity was 95.8%, the specificity was 94.9%, the accuracy was 95.1%, the positive predictive value was 79.3%and the negative predictive value was 99.1%using CT image of intestinal period for diagnosing small intestinal diseases. (4) The intestinal period showed small intestinal lesions and confirmed by pathology including 22 cases of small intestinal lympho?ma, 10 cases of stromal tumor, 1 case adenoma, cavernous 3 cases hemangioma and 8 cases of Crohn's disease. The diagno?sis of hemangioma should be combined with arterial phase. Conclusion Small intestinal wall and blood vessels have better display performance in the intestinal phase of multiphase CT enterography, using the arterial phase and intestinal phase scan?ning, we can make an accurate diagnosis for the majority of small intestinal diseases.

Feature analysis for 31 cases of multislice CT angiography in mycoplasma pneumonia / 中国医学装备

Objective: To analyze the imaging features of mycoplasma pneumonia in order to improve the early diagnosis and treatment of mycoplasma pneumonia as well as reduce misdiagnosis. Methods:Multislice CT data of 31 mycoplasma pneumonia patients during 2012.4 to 2014.4 in our hospital were retrospectively analyzed. Results:Multislice CT results showed that 22 cases(70.97%) occurred in one side of lung, in which 12 cases (38.71%) located in the left lung(two cases located in the lobi superior(6.45%)and 10 cases located in the lobi inferior(32.26%));10 cases (32.26%) located in the right lung , in which 4 cases located on the lobi superior (12.90%), four cases at the lobi inferior(12.90%), two cases involved both lobi medius pulmonis and lobi inferior(6.45%). 9 cases (29.03%) were double lung involvement. The changes of CT are diverse which included glass-like images, consolidation, air bronchogram, bronchial vascular bundle thickening, pleural effusion and mediastinal lymph nodes enlargement. Conclusion:Patients with mycoplasma pneumonia always have varied radiographic changes and chest multislice CT has a certain sense of early diagnosis.

Research on predictive values of Philips 256-slice CT angiography in acute coronary events / 中国医学装备

Objective:To investigate the Philips 256-slice CT coronary angiography images on a variety of forms of coronary artery calcification and coronary stenosis in relation to predict the value of the study of acute coronary events by coronary angiography and coronary artery calcification score.Methods: From May 2014 to February 2015 in the Third Affiliated Hospital of Qiqihar in patients with suspected coronary artery disease, with256-slice spiral CT coronary artery enhancement scanning and DSA, and using software of automatic analysis for coronary artery calcium score analysis, and comparing the accuracy of the two methods of inspection, combined with the clinical data of patients with scientific prediction of acute coronary events.Results: Different forms of coronary artery calcified plaque resulting in local differences in the proportion of luminal stenosis were statistically significant. AS calcium score standard are in grouped in patients with coronary heart disease (CHD),along with increasing calcium score,the risk of coronary heart disease also increase.Conclusion: The diagnosis of coronary artery calcification score of coronary heart disease have a higher value. Calcium score for judging coronary artery stenosis to have high specific degrees, worthy of clinical popularization and application.

Rol de la TC multicorte con RMP en el diagnóstico de la hernia obturatriz: presentación de un caso / Role of multislice CT with MPR (multi-planar reformation) in the diagnosis of obturator hernia. a case report

La hernia obturatriz (HO) es poco frecuente y representa del 0.05 al 0.4 por ciento del total de hernias. Debido a su rareza y a su presentación inespecífica, el diagnóstico es por lo general tardío y las tasas de mortalidad elevadas (12-70 por ciento). Se presenta un caso típico de HO diagnosticada en el preoperatorio mediante TC Multi-corte con RMP y tratado mediante laparotomía de urgencia con buen resultado. El empleo de TC Multicorte con RMP de abdomen y pelvis, en cuadros de obstrucción intestinal en mujeres añosas, sin antecedente de cirugías previas ni hernias objetivables, tiene gran valor para el diagnóstico preoperatorio precoz de HO y podría contribuir a reducir las elevadas tasas de morbilidad y mortalidad.

Abstract. The obturator hernia (OH) is rare and accounts for 0.05 to 0.4% of all hernias. Because of its rarity and its nonspecific presentation, diagnosis is usually late and has high mortality rates (12-70%). A typical case of OH diagnosed preoperatively by Multislice CT with MPR and treated using emergency laparotomy with good results, is presented. The use of Multislice CT with MPR of the abdomen and pelvis, in symptoms of intestinal obstruction in elderly women with no history of previous surgery or objectified hernias, has great value for early preoperative diagnosis of OH and could help reduce the high rates of morbidity and mortality.

Research on the application of CT enhancing scan based on bolus tracking technique in upper abdomen / 中国医学装备

Objective: To evaluate the application value of CT enhancing scan based on bolus tracking technology in the upper abdomen. Methods:200 patients were examined by CT in the upper abdomen. Contrast agent was injected through the hand vein at 1.5 ml/kg, with pressure of 300 Pa, flow rate 2.5 ml/s. Before injection, we must complete the first scanning .Then , another 2 or 3 scans were done. Results:188 cases can show abdominal aorta, hepatic artery, splenic artery, hilar vessel branches, portal vein, inferior vena cava very well. Another two cases failed .The others were not ideal because of portal hypertension. Conclusion:CT enhancing scan based on bolus tracking technique in the upper abdomen can obtain good images to meet clinical needs.

Clinical research on diagnosis of traumatic rib fractures by multislice CT VRT and DR plain film / 中国医学装备

Objective:To research the value of diagnosis of traumatic rib fractures by multislice CT VRT and DR plain film. Methods: Seventy-two cases of traumatic rib fracture patients were diagnosed by DR film and multislice CT VRT. Results:Multiple rib fractures than single, most of them occurred in the 4-10 ribs and axillary segment, 97.2%of 16-slice spiral CT three-dimensional reconstruction of patients with rib fracture diagnosis rate significantly higher than DR plain film diagnosis rate 80.3%(x2=19.15, P<0.01), DR plain film missed rib fractures are mainly located in the costal cartilage (58.1%), 16-slice spiral CT reconstruction is still found 19 other fractures and lung complications 16cases. Conclusion:16-slice CT the thin layer VRT diagnosis of rib fractures greatly improves the diagnostic accuracy.

Síndrome del asa o lazo de la arteria pulmonar: presentación de un caso diagnosticado en un paciente adulto / Pulmonary artery sling Syndrome. report of a case diagnosed in an adult patient

El Síndrome del Asa de la Arteria Pulmonar, también conocido como Lazo de la Arteria Pulmonar y Sling Sign de la literatura de habla inglesa, es una forma rara de malformación congênita del origen y recorrido de la arteria pulmonar izquierda, que se incluye dentro de las alteraciones en "anillo" que modifican la normal anatomía de los vasos mediastínicos y producen compresiones sobre la vía aérea. Se cree que se produce por un fallo en la formación del sexto arco aórtico, a menudo con evolución fatal si no es tratada a tiempo, debido a la severidad de los trastornos respiratorios que provoca o por anomalías vasculares graves asociadas. Este síndrome fue descrito por primera vez por Glaevecke y Doehle en 1897(1). Si bien es poco frecuente, varios autores han publicado casos de esta anomalía(2-5) principalmente diagnosticada en niños y recién nacidos. Efectuar el diagnóstico en adultos, es extremadamente infrecuente. Es por ello que adquiere mayor interés la descripción de los hallazgos como diagnóstico inicial en este paciente de 51 años de edad, prácticamente asintomático y que concurre a la consulta clínica solamente con disnea de grado leve, detectado en un aparato TC Multicorte realizado para el estudio de su disnea.

Pulmonary Artery Sling Syndrome is a rare form of congenital malformation of the origin and course of the left pulmonary artery, which is included within the "ring" irregularities that modify the normal anatomy of the mediastinal vessels and produce airway compressions. It is believed to be caused by a failure in the formation of the sixth aortic arch, often with a fatal outcome if not treated in time due to the severity of the respiratory disorders it causes or for severe associated vascular abnormalities. This syndrome was first described by Glaevecke and Doehle in 1897(1). Although rare, several authors have reported cases of this anomaly(2-5) primarily diagnosed in children and newborns.Diagnosing this in adults is extremely rare. That is why describing the findings as an initial diagnosis, in this almost asymptomatic 51 year old patient who attended the clinical consultation only with mild dyspnea, detected on a Multislice CT system used to study his dyspnea, acquires greater interest.

Avaliação volumétrica de defeitos ósseos em fissuras de rebordo alveolar e palato duro por meio da 3D-TC multislice e feixe cônico / Volumetric assessment of hard palate and alveolar cleft using multislice and cone beam 3DCT

As fissuras de rebordo alveolar e palato duro estão entre as malformações mais frequentes do corpo humano, podendo causar extensas deformidades ósseas faciais, com implicações biopsíquico-sociais marcantes. A avaliação da extensão desses defeitos ósseos, através de exames por imagem, tem sido feita com o objetivo de diagnosticar e planejar a terapêutica reabilitadora dos pacientes. O presente estudo tem por objetivo desenvolver uma metodologia de pós-processamento de imagens tomográficas para avaliação volumétrica de defeitos ósseos confeccionados em palato duro e rebordo alveolar de crânios macerados, mimetizando fissuras trans-forâmens unilaterais, e verificar a aplicabilidade clínica do Tomógrafo Computadorizado espiral Multislice e do tomógrafo computadorizado por feixe cônico na análise desses defeitos. Para tanto, nove crânios provenientes da Faculdade Cathedral, da cidade de Boa Vista- RR, foram escaneados em um Tomógrafo Computadorizado Multislice pertencente ao Hospital Geral de Roraima e em um tomógrafo computadorizado por feixe cônico de uma clínica privada, na cidade de Fortaleza-CE. As imagens foram, posteriormente, encaminhadas para análise ao Laboratório em Terceira Dimensão(LAB-3D) da Faculdade de Odontologia da USP, utilizando-se uma estação de trabalho independente e aplicando-se programas específicos de computação gráfica...

Oral clefts are one of the most frequent malformations of the human body, causing extensive facial bone deformities, compromising biological, psychic and social the individuals affected. Multislice CT and CBCT have been used to assess the volume of bone defect with the goal of diagnosis and rehabilitative therapy planning of the patients. The aim of this study were to develop a methodology for post-processing of tomographic images for volumetric assessment of bone defects made in the hard palate and alveolar ridge of dry skulls, mimicking unilateral trans-foramen clefts; and to determine the clinical applicability of multislice spiral computed tomography, and cone beam computed tomography in the analysis of these defects. Nine dry skulls from the Cathedral College in Boa Vista-RR were scanned on a multislice CT scanner at the Hospital Geral de Roraima and a cone beam computed tomography in a private clinic in Fortaleza-CE. The images were sent for analysis at Three Dimensional Laboratory (LAD-3D) of the Dentistry School, São Paulo University, using an independent workstation and implementing specific computer graphics programs. All images were analyzed by two examiners at different times and twice to proceed the intra and inter-examiners analysis. For analysis the methodology of image processing, we compared the results obtained by multislice CT using skulls with and without wax model in the region of bone defect...

Multislice CT Virtual Intravascular Endoscopy for Assessing Pulmonary Embolisms: a Pictorial Review

Multislice CT has been widely used in clinical practice for diagnosing cardiovascular disease due to its reduced invasiveness and its high spatial and temporal resolution. As a reliable alternative to conventional pulmonary angiography, multislice CT angiography has been recognized as the first line technique for detecting and diagnosing pulmonary embolism. A pulmonary embolism located in the main pulmonary artery, as well as being located in the segmental branches, can be accurately detected with multislice CT imaging, and especially with the use of 16- and 64-slice CT scanners. Visualization of pulmonary embolisms has traditionally been limited to 2D, multiplanar reformation and the 3D external surface visualizations. In this pictorial review, we present our experience of using 3D virtual intravascular endoscopy to characterize and evaluate the intraluminal appearance of pulmonary embolisms in a group of patients who were suspected of having pulmonary embolism and who were undergoing multislice CT angiography. We expect that the research findings from this study will provide insight into the extent of disease and the luminal changes to the pulmonary arteries that are due to the presence of thrombus, and so monitoring of the progress of disease and predicting the treatment outcome can well be achieved.

Rol de la TC multicorte en las hernias diafragmáticas: Ensayo iconográfico / Role of Multislice Computed Tomography in the evaluation of diaphragmatic hernias: Pictorial essay

Las hernias diafragmáticas consisten en la migración de estructuras abdominales hacia el tórax a través de un defecto del diafragma. Ellas pueden tener origen congénito (de Morgagni y de Bochdalek) o adquirido, incluyendo las traumáticas o no traumáticas (del hiato, defectos diafragmáticos posteriores). Debido a que en algunas hernias diafragmáticas está indicada la reparación quirúrgica, los métodos de diagnóstico por imágenes cumplen un rol fundamental. La TC multicorte, con su capacidad multiplanar y posibilidad de efectuar cortes finos, nos permite valorar y caracterizar adecuadamente el defecto diafragmático y sus complicaciones. En este ensayo iconográfico realizamos un breve repaso de la embriología y anatomía del diafragma, revisamos los distintos tipos de hernias diafragmáticas y la utilidad de la TC multicorte.

Diaphragmatic hernias are characterized by the migration of abdominal structures into the chest through a diaphragmatic defect. These may have either a congenital etiology (e.g., Morgagni and Bochdalek), or an acquired etiology, including traumatic and nontraumatic hernias (hiatal, posterior diaphragmatic defects). Since a surgical repair is indicated in certain types of hernias, imaging diagnostic methods play a key role. Multislice Computed Tomography (MSCT) allows multiplanar views and thin section evaluation, thus providing a useful tool for the assessment and characterization of the diaphragmatic defect and its complications. In this pictorial essay we briefly review the diaphragm anatomy and embryology, the different types of diaphragmatic hernias and the role of MSCT.

Assessment of the Intracranial Stents Patency and Re-Stenosis by 16-Slice CT Angiography with Optimized Sharp Kernel : Preliminary Study

OBJECTIVE: Our retrospective study aimed to determine whether 16-slice computerized tomography (CT) angiography optimized sharp kernel is suitable for the evaluation of visibility, luminal patency and re-stenosis of intracranial stents in comparison with conventional angiography. METHODS: Fifteen patients with symptomatic intracranial stenotic lesions underwent balloon expandable stent deployment of these lesions (10 middle cerebral arteries, 2 intracranial vertebral arteries, and 3 intracranial internal carotid arteries). CT angiography follow-up ranged from 6 to 15 months (mean follow-up, 8 months) after implantation of intracranial stents and conventional angiography was confirmed within 2 days. Curved multiplanar reformations with maximal intensity projection (MIP) with optimal window settings for assessment of lumen of intracranial stents were evaluated for visible lumen diameter, stent patency (contrast distal to the stent as an indirect sign), and re-stenosis by two experienced radiologists who blinded to the reports from the conventional angiography. RESULTS: All of stents deployed into symptomatic stenotic lesions. All stents were classified as patent and no re-stenosis, which was correlated with results of conventional angiography. Parts of the stent lumen could be visualized in all cases. On average, 57% of the stent lumen diameter was visible using optimized sharp kernel. Significant improvement of lumen visualization (22%, p<0.01) was observed using the optimized sharp kernel compared with the standard sharp kernel. Inter-observer agreements on the measurement of lumen diameter and density were judged as good, respectively (p<0.05). CONCLUSION: Sixteen-slice CT using the optimized sharp kernel may provide a useful information for evaluation of lumen diameter patency, and re-stenosis of intracranial stents.

Urotomografía multicorte: aplicaciones clínicas / Multislice Kidney CT Scan: clinical applications

Hasta ahora en nuestro medio el diagnóstico de las uropatías se fundamentaba en la historia clínica y un estudio radiológico convencional; siendo así, la valoración de la vía excretora se ha limitado al ultrasonido (US), la urografía intravenosa (UIV) la pielografía ascendente (PA) y la pieloureterocistografía descendente percutánea. La sensibilidad y especificidad de estas pruebas no son altas, por lo que se han desarrollado otros procedimientos imagenológicos para este tipo de estudio, tales como la resonancia magnética nuclear (RMN) y la tomografía helicoidal con estudio multiplanar. Desde algún tiempo atrás, se viene utilizando el estudio tomográfico de las vías urinarias, mostrando alta sensibilidad y especificidad en el diagnóstico de la urolitiasis, permitiéndonos además valorar la anatomía renoureterovesical y de los tejidos circundantes, por esto la tomografía computada multicorte (TCMC) se presenta como una técnica básica para el estudio de la etiología de la hematuria y fundamental en los casos de síndrome de la unión pieloureteral, con lo cual nos permite valorar la circulación y elegir la mejor técnica quirúrgica a utilizar.

In our society the diagnosis of the uropatologies was based in the clinical history and a conventional radiological study. The types of exams used are the excretory urography and the ascending pyelography (PA). The sensibility and specificity of these tests are not high that is why or types of test exists such as the MRI and CT scan. The CT scan is a basic technique to study the etiology of hematuria and fundamental in cases of pyelo - urethral union syndrome which allows us to evaluate the circulation and choose the best surgical technique to use.

Valoración de la función ventricular con tomografía computarizada de 16 detectores (TCMD-16): Correlación con resonancia magnética cardiovascular / Evaluation of left ventricular function with a 16-slice multidetector tomograph (MDCT-16): Correlation with cardiovascular magnetic resonance imaging

La evaluación de parámetros funcionales del VI tienen implicaciones tanto pronosticas como terapéuticas en pacientes con cardiopatías. La angiotomografía coronaria con TCMD-16 permite obtener imágenes de la anatomía coronaria y por su alta resolución temporal y espacial, obtener datos de la función ventricular izquierda. El objetivo de este estudio fue correlacionar el uso de la TCMD-16 para la valoración de parámetros de función ventricular izquierda, utilizando la RM como estándar de referencia. Métodos: Resonancia: Se utilizó un resonador GE Cvl, de 1.5 Teslas optimizado para aplicaciones cardiovasculares. Mediante una secuencia de precesión rápida de estado fijo de manera sincronizada al ECG, (SSFP, Grosor de corte de 10 mm, Flip Angle 45, FOV 36 cm., NEX 1, Frecuencia 256, Fase 128, FOV parcial 0.75, 16 VPS), se obtuvieron de 6 a 8 imágenes en eje corto desde la base hasta el ápex del VI. Tomografía: Con un TCMD-16 GE Lightspeed sincronizado al ECG, se obtuvieron imágenes del corazón tras la administración de 80 mis. de contraste no-iónico. Las imágenes fueron reconstruidas para obtener de 6 a 8 cortes de manera similar a la RM. Ambos estudios fueron independientemente analizados por 2 operadores quienes obtuvieron los parámetros ventriculares. Las comparaciones fueron analizadas mediante la prueba de t de Student pareada y las correlaciones mediante regresión linear, considerando significativo cuando p<0.05. Resultados: Se evaluaron 20 pacientes consecutivos con TAC y RM cardiaca, 18 del sexo masculino, con una edad promedio de 52 ± 15 años. No hubo diferencia significativa entre las mediciones por TAC y por RM cardiaca del volumen telediastólico (VTD) y telesistólico (VTS) del VI, ni en el volumen latido (VL), la masa ventricular izquierda o la fracción de expulsión del VI (FEVI). Conclusión: Los resultados demuestran una alta correlación entre los parámetros de función ventricular sistólica clínicamente relevantes evaluados por TAC y por RM cardiaca. Esto sugiere que puede evaluarse la función ventricular en forma satisfactoria al mismo tiempo que se estudian estructuralmente las coronarias mediante el TCMD-16.

The evaluation of Left ventricular function has both prognostic as well as therapeutic implications in patients with heart disease. Non-invasive coronary angiography with computed tomography using 16 slices (MDCT-16) allows to obtain images of the coronary anatomy due to its high spatial and temporal resolution, and also, to obtain data regarding Left ventricular function. The objective of this study was to correlate the use of MDCT-16 forthe evaluation of the Left ventricular parameters using MRI as the Standard of reference Methods: MRI: Se A 1.5 Tesla GE Cvl Scanner optimized for cardiovascular applications was used. Using an ECG gated steady state fast precession sequence (SSFP, Thickness 10 mm, Flip Angle 45, FOV 36 cm. NEX 1, Frequency 256, Phase 128, Partial FOV 0.75, 16 VPS), 6 to 8 short axis images of from base to apex of the left ventricle were obtained. Tomography: Using a 16 slice Multidetector tomograph (GE Lightspeed) and using ECG synchronization, images of the heart were obtained after the administration of 80 mis. of no-ionic contrast. The images were reconstructed off-line to obtain from 6 to 8 slices in a similar fashion to that of MR. Both studies were independently analyzed by 2 operators who obtained the ventricular function data. Linear correlation and a Paired T Student test was used to analyze the data and was considered significant when p < 0.05. Results: 20 consecutive patients were evaluated with MDCT-16 and MRI, 18 males, mean age 52 ± 15 years. There was no significant difference among the measurements for cardiac CT and MRI of the end-diastolic volume (EDV) and end-sistolic volume (ESV), stroke volume (SV), LV Mass or LV ejection fraction (LVEF). Conclusion: This results show a high correlation among the clinically relevant ventricular function parameters evaluated by cardiovascular CT and MRI. This findings suggest that ventricular function can be successfully evaluated along with the coronary anatomy using MDCT-16.

Clinical Analysis of 15 Cases of Acute Pulmonary Embolism / 中国医师杂志

Objective To analyze the clinical and laboratory features of acute pulmonary embolism for diagnosis as possible as early.Methods For 15 patients of pulmonary embolism,who have not history of heart-lung disease and have been diagnosed by high speed multislice CT, the clinical and other laboratory data of these patients were retrospectively analyzed.Results The clinical manifestations were dyspnea ,chest distress, palpitation;the signs including tachypnea, systole murmur, tachycardia etc. The examinations were mainly color Dopple echocardiography and blood gas analysis. In some cases of embolism were found in their pulmonary artery; in all cases tricuspid regurgitation were found by color Dopple echocardiography and their pulmonary systole pressure were all over normal value(42～76mmHg).The blood gas analysis showed that PaO 2 was obviously lower than normal value(30～65mmHg).Conclusions The patient who has symptoms of dyspnea and palpitation must be examined by high speed multislice CT , color Dopple echocardiography and other measurements to get an immediate diagnosis . The first choice is color Dopple echocardiography when there is no high speed multislice CT. The patients can get exact diagnosis and prompt treatment by manifestation of pulse spectral of pulmonary artery, increase of pulmonary artery pressure, right ventricular enlargement.

Study of pancreatic carcinoma with multislice CT perfusion imaging / 中国实用内科杂志

Objective To investigate the perfusion characteristics of normal pancreas and pancreatic carcinoma on multi-slice spiral CT(MSCT).Methods Perfusion CT for pancreatic cancer was performed with sixteen-slice spiral CT in 26 patients(all of them were then confirmed by pathology).Eighteen patients without pancreatic disorders served as controls.Contrast medium-enhanced dynamic CT was performed,and the data were analyzed by using commercial software to calculate tissue blood flow(BF),blood volume(BV),mean transit time(MTT),and vascular permeability-surface(PS)area product.Perfusion parameters of normal pancreas and tumors tissues were compared.Results Technical failures were experienced in 1(3.85%)subjects of pancreatic carcinoma.The mean BF,BV,MTT and PS in pancreatic carcinoma were(68.89?73.42)mL/(100 mg? min),(10.02?3.59)mL/100 mg,(8.23?3.26)s,(28.63?9.35)mL/(100 mg?min),respectively.The mean BF,BV,MTT and PS in normal pancreas tissue were(173.53?71.33)mL/(100 mg?min),(14.43?3.15)mL/100 mg,(7.15?5.45)s,(13.98?8.53)mL/(100 mg?min),respectively.The mean BF,BV and PS between pancreatic carcinoma and normal pancreas were statistically significant(BF,PS:P0.05).Conclusion CT perfusion imaging can be used to identify patients with pancreatic carcinomas,because individual differences exist in the results of CT perfusion.

Bronchial arterial multislice CT angiography for evaluation of intra-spinal canal, esophageal and tracheal enhancement / 介入放射学杂志

Objective To search for a better way than DSA to display the bronchial arterial (BA) supply of spinal cord, esophagus, trachea, etc., and for further evaluation of BA supply to the above structures, along with reducing the complications of trans-BA infusion and/or embolization. Methods Multislice CT angiography of BA (BA-MSCTA) was performed on 19 patients suffering from lung cancer or hemoptysis due to bronchiectasis after undergoing digital subtraction angiography BA (BA-DSA). Totally 10ml of 45% contrast medium was injected into BA (1～2 ml/s), BA-MSCTA was started 5 s after the injection, scanning from low cervical region to the bottom of lung (collimation: 5 mm; no overlapping reconstruction ). The intra-spinal canal, esophagus, trachea, etc. were enhanced. Results On BA-DSA, except one case in which a bronchial artery was faintly displayed, no spinal artery, intra-spinal canal, esophagus or trachea enhancement could be demonstrated. While on BA-MSCTA, intra-spinal canal associated with an intercostobronchial trunk enhancement due to truncus formation were observed in seven cases, including five cases of spinal enhancement (5/19,26.3%). 15 cases of esophageal enhancement and 18 cases of tracheal enhancement were also observed. Conclusion BA-CTA is superior to BA-DSA in displaying the BA supply of spinal cord, esophagus, trachea, etc.. Spinal arteries are more likely to appear in intercostobronchial truncus cases.