Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 3 de 3
Filter
Add more filters










Database
Publication year range
1.
Radiol Med ; 116(3): 417-31, 2011 Apr.
Article in English, Italian | MEDLINE | ID: mdl-21225361

ABSTRACT

PURPOSE: This study assessed means by which to optimise 64-slice computed tomography urography (CTU) in evaluating the urinary tract, with a view to obtaining the best trade-off between image quality and radiation dose. MATERIALS AND METHODS: Image quality was analysed in terms of spatial and contrast resolution on several scans of a phantom performed with automatic dose modulation and different reconstruction kernels and accepted noise level. Data were compared with the radiation dose values recorded for 52 patients who underwent CTU examination. RESULTS: Radiation dose and image quality differed considerably depending on the reconstruction parameters, even though a higher dose did not always imply better image definition. Data obtained in the phantom were consistent with those obtained in patients. Depending on the clinical problem, the radiation dose varied from 6.2 to 17.6 mSv. CONCLUSIONS: CTU cannot be considered a standard examination: the scan parameters need to be adapted to the image quality required for the specific clinical problem.


Subject(s)
Radiation Dosage , Tomography, X-Ray Computed/methods , Urography/methods , Artifacts , Contrast Media , Humans , Phantoms, Imaging , Radiation Protection/methods , Radiographic Image Interpretation, Computer-Assisted
2.
Radiol Med ; 115(6): 920-35, 2010 Sep.
Article in English, Italian | MEDLINE | ID: mdl-20574699

ABSTRACT

PURPOSE: This study sought to assess the diagnostic accuracy of 64-slice computed tomography urography (CTU) in evaluation of the urinary tract. MATERIALS AND METHODS: A total of 322 CTU procedures were carried out in 317 consecutive patients (mean age 64.4 years). The findings were compared with previous and subsequent patient workup considering both laboratory and imaging studies, such as urine cytology, abdominal ultrasound and CT, cystoscopy, retrograde pyelography, surgery and pathology. RESULTS: Out of 322 CTU examinations, 169 showed significant urinary tract changes, whereas 153 revealed no urinary disease, in good agreement with the follow-up. In particular, in bladder evaluation, for which we have a direct comparison with cystoscopy in 125 patients, we calculated a CTU sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and diagnostic accuracy of 85%, 94%, 92%, 89% and 90%, respectively. CONCLUSIONS: CTU was accurate for urinary tract evaluation, but it cannot replace cystoscopy in patients in whom a malignant bladder disease is suspected.


Subject(s)
Tomography, X-Ray Computed , Urography/methods , Urologic Diseases/diagnostic imaging , Adolescent , Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Predictive Value of Tests , Retrospective Studies , Sensitivity and Specificity , Urinary Bladder Neoplasms/diagnostic imaging
3.
Radiol Med ; 112(5): 703-21, 2007 Aug.
Article in English, Italian | MEDLINE | ID: mdl-17653627

ABSTRACT

Magnetic resonance imaging (MRI) has opened new possibilities to current diagnostic radiology in the evaluation of bone marrow. Compared with other imaging modalities, MRI is the only technique able to directly visualise bone marrow with its different components of red and yellow marrow. Other advantages of MRI are high-contrast resolution and multiplanar view, as well as extensive coverage of the skeleton with whole-body MRI (WBMRI). However, specificity of signal alterations of bone marrow is low. Therefore, MRI findings need to be integrated with clinical and laboratory findings as well as with haematological and oncological evaluation. MRI provides information that effectively aids diagnosis, staging and follow-up of various bone marrow disorders. There is increasing interest in the capabilities of MRI in the evaluation of bone marrow, in particular of haematological malignancies. According to some authors much work remains to be done to improve sensitivity and specificity of MRI in order to define the real clinical value of this imaging modality in the multidisciplinary management of patients with a haematological malignancy. This article presents recent developments and perspectives in the use of MRI in oncohaematological diseases.


Subject(s)
Bone Marrow Diseases/diagnosis , Hematologic Neoplasms/diagnosis , Magnetic Resonance Imaging/methods , Bone Marrow Diseases/therapy , Contrast Media , Diagnosis, Differential , Hematologic Neoplasms/therapy , Humans , Sensitivity and Specificity
SELECTION OF CITATIONS
SEARCH DETAIL
...