الفهرس 
CT Anatomy of RetroperitoneumOnly 14 pages are availabe for public view
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Abstract
CT is ideal for the assessment of retroperitoneal disease because it provides discrete sectional images of the organs and retroperitoneal compartments.
Generally, spiral CT is superior to conventional CT in detection of smaller lesions. It appears that spiral CT has no benefit over conventional CT in detection of large lesions. However, it has advantage of limiting the scanning time and giving much superior 3D reformats.
Helical CT represents an exciting advance in evaluation of renal disease, offering several techniques advantages in evaluation of the kidney. Scans can be obtained during specific phases of renal contrast enhancement and minimal respiratory artifact results in less potential errors in diagnosis.
Helical CT enables accurate evaluation of renal cystic lesions. In such cases, many other complementary examinations as MRI, angiography and diagnostic puncture can be avoided.
Cystic lesions of the pancreas are increasingly being recognized due to the widespread use of cross-sectional imaging. The initial evaluation of a pancreatic cyst should be directed toward exclusion of a pseudocyst. Helical CT allows thin-section scanning of the pancreas and has become the preferred imaging modality for both initial detection and characterization of pancreatic cysts.
Adrenal cysts are infrequent. The apparent increasing frequency of adrenal cysts is likely related to incidental radiologic detection of adrenal masses. Helical CT provides the ability to image the adrenal glands rapidly at short intervals following contrast administration giving an opportunity for studying iodinated contrast dynamics and help in characterizing of focal adrenal lesions.
Retroperitoneal cystic masses, which arise within the retroperitoneal space but outside the major organs, are uncommon. However, the widespread use of computed tomography for evaluating abdominal and retroperitoneal diseases has increased the detection rate for retroperitoneal cystic lesions.
Multi–detector CT is the latest advancement in CT technology and is now more readily available than in the past. Multi–detector row CT scanners are now up to four times faster than conventional single–detector row helical CT scanners. It has the same advantages as single –detector helical CT that reduces partial volume effect and effective use of intravenously contrast material. In addition, multi-detector CT technology allows the acquisition of different image thickness from data set by using helical reconstruction weighting algorithms and interpolation of adjacent helical data sets.