ABSTRACT
Objective:To evaluate the value of integrated PET/MR in assessing myocardial viability in ischemic heart disease.Methods:A total of 39 patients (28 males, 11 females; age (60.1±12.0) years) diagnosed with ischemic heart disease in Xuanwu Hospital, Capital Medical University were retrospectively enrolled from September 2020 to December 2021. All patients underwent cardiac 13N-NH 3·H 2O and 18F-FDG PET/MR examinations. Late gadolinium enhancement (LGE) sequence was included in MRI scan. PET and MRI images were analyzed and myocardial viability of each myocardial segment was evaluated according to the American Heart Association (AHA) 17 segment method. The extent of left ventricular infarcted myocardium was measured based on PET and MRI images. Weighted Kappa test was used to evaluate the agreement of PET and MRI in assessing myocardial viability. The extent of infarcted myocardium measured by PET and MRI was compared by paired- t test, and Pearson correlation analysis was used to assess the correlation between them. Results:There was a moderate agreement between PET and MRI in assessing myocardial viability ( Kappa=0.532, P<0.001), with the agreement rate of 69.83%(463/663). There was no significant difference but strong correlation between the extents of infarcted myocardium measured by PET and MRI ((23.89±14.23)% vs (23.55±11.90)%; t=-0.24, P=0.809; r=0.79, P<0.001). In segments with normal perfusion and metabolism on PET, 22.52% (100/444) showed abnormal enhancement on MRI. On the other hand, 39.89% (73/183) of the segments classified as non-viable on MRI showed normal or viable on PET. Conclusion:Integrated PET/MR is able to take full advantage of the complementary nature of PET and MRI, achieving the comprehensive and accurate evaluation of myocardial viability.
ABSTRACT
One of the research focus of 2018 Radiological Society of North America (RSNA) is artificial intelligence (AI). AI related cardiac MRI studies published in recent years and 2018 RSNA were reviewed in this article.
ABSTRACT
ervical spine injury is commonly associated with road-traffic accidents. The true incidence of cervical spine injuries is unknown due to under-reporting of such injuries. Cervical spine injury is associated with high morbidity and mortality if it is missed. With the advancement of imaging modalities, the number of missed cervical injuries has reduced. Nevertheless, some clinicians are dependent solely on imaging tools to rule out cervical spine injury in a trauma victim. We report two cases of “near miss” C6 fracture to highlight the importance of a detailed clinical history and clinical examination with imaging as an adjunct to rule out cervical injury.
ABSTRACT
La enfermedad de moyamoya (EMM) es una vasculopatía que se caracteriza por una estenosis progresiva (1) dela porción terminal de ambas carótidas internas hasta su oclusión, asociada a una red vascular anormal de vasoscolaterales en la base del cerebro que generan un patrón angiográfico característico semejante a una bocanadade humo o moyamoya en japonés, de ahí su nombre, dado en 1969 por Suzuki y Takaku (2, 3). Aunque suetiología es desconocida, se han presentado algunos casos en los cuales se relaciona con otras enfermedades,lo que puede sugerir factores genéticos presentes en su patogénesis. La enfermedad de moyamoya es pocofrecuente a nivel mundial; de hecho, la mayor frecuencia de reporte se da en Japón, con una prevalencia eincidencia de 6,03 y 0,54 por 100.000 habitantes, respectivamente (4), razón por la cual se documentan doscasos de moyamoya presentados en el Hospital Universitario Los Comuneros de Bucaramanga entre diciembrede 2014 y enero de 2015. Dichos casos corresponden a dos pacientes masculinos de 27 y 46 años, quienespresentaron cuadro clínico de dos semanas de evolución de cefalea fuerte y que tras estudios de neuroimagencomo tomografía axial computarizada (TAC) cerebral simple y Angio-TAC para el caso 1 y de tomografíacerebral para el caso 2, fueron diagnosticados con panangiografía cerebral.
Moyamoya disease (MMD) is a vascular disease characterized by a progressive narrowing of the terminal portion of both internal carotid until its occlusion, associated with an abnormal vascular network of collateral vessels in the brain stem which generate a characteristic angiographic pattern that resembles a puff of smoke or moyamoya in Japanese, hence its name, given in 1969 by Suzuki y Takaku, (2, 3). Although its etiology is unknown, there have been some cases where it is related to other diseases, which may suggest genetic factors in its pathogenesis. Moyamoya disease is rare in the world, in fact, it is reported mainly in Japan with a prevalence and incidence of 6.03 and 0.54 per 100 000 inhabitants respectively. Because of this, two cases of moyamoya presented in the Hospital Universitario los Comuneros de Bucaramanga between December of 2014 and January of 2014 were documented. The cases were detected in two male patients of 27 and 46 years old, who presented clinical evolution of two weeks of strong headache, and after neuroimaging studies like Computerized Axial Tomography (CAT) scan and Angiotac for case number 1 and brain tomography for case number 2, they were diagnosed with Pan-angiography.
Subject(s)
Humans , Cerebral Infarction , Moyamoya DiseaseABSTRACT
The development of radiological equipment such as MDCT or ultrasonography has increased the diagnostic accuracy of aortic aneurysms and has allowed for improvements in surgical and interventional treatment techniques. However, the mortality and morbidity rate of aortic aneurysms has not decreased significantly. For this reason, there is continuous interest in radiological evaluations of aortic aneurysms. This report reviews the radiological image findings and useful indications for both the diagnosis and surveillance of aortic aneurysms. The popular radiological features of an aortic aneurysm are aortic expansion, combined atherosclerosis, intraluminal mural thrombus, perianeurysmal inflammation and fibrosis, and perianeurysmal hemorrhage due to rupture. As rupture is the most important complication of an aortic aneurysm, various signs of an impending rupture have been suggested. These include the following: a maximum aneurysmal diameter larger than the threshold value, a high expansion rate, periaortic sentinel hemorrhage, and a hyperattenuating crescent in the mural thrombus or aneurysmal wall. To acknowledge the impending rupture of an aortic aneurysm, careful depiction of the clues is indispensable.
Subject(s)
Aneurysm , Aortic Aneurysm , Atherosclerosis , Diagnosis , Fibrosis , Hemorrhage , Inflammation , Mortality , Rupture , Thrombosis , UltrasonographyABSTRACT
Objective To describe MRI findings of 12 cases of non hemorrhagic contusion of corpus callosum. Methods The MR images of 12 patients were reviewed retrospectively. 11 cases were victims of vehicle accident and 1 patient was injured by falling. All patients were examined with precontrast CT and MR imaging within 3 days (8 cases) and 6 to 30 days (4 case). Results The lesions were located at splenium (3 cases) and mainly at body (9 cases). There was no abnormal signs of corpus callosum on CT images. MR study in all 12 cases demonstrated isointense or slight hypointense signal compared with gray matter on T 1WI and obvious hyperintense signal lesions on T 2WI on corpus callosum. There was no hemorrhagic signal or density on MR and CT images at corpus callosum. These contusion lesions were demonstrated nicely on SE or FSE T 2WI images. On FLAIR sequence, these lesions were revealed more clearly for the signal of CSF was suppressed. MR follow up examination in one case four months later, the contusion lesion became malacia with the signal similar to that of CSF. Several other multiple contusion and hemorrhage lesions were detected in ten cases. Conclusion The non hemorrhagic contusion of corpus callosum is a relatively rare species. These lesions can′t be found on CT images, while MRI is the best tool for detecting them. SE or FSE T 2WI is the main sequence for demonstrating. These lesions could be seen more clearly on FLAIR sequence. The isointense or slight hypointense T 1WI signal and hyperintense T 2WI signal of corpus callosum after head injury is the typical MR imaging signs.