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Bolus-enhanced renal spiral CT: technique, diagnostic value and drawbacks
H U Kauczor1, H C Schwickert, F Schweden
1Klinik für Radiologie, Johannes Gutenberg-Universität Mainz, Germany.
European Journal of Radiology
|August 1, 1994
Summary
Precontrast computed tomography (CT) scans are crucial for detecting renal calcifications. Bolus-enhanced spiral CT and delayed postcontrast scans offer similar diagnostic yields for renal lesions, but bolus-enhanced scans better assess vascularity.
Area of Science:
- Radiology
- Medical Imaging
- Nephrology
Background:
- Renal CT imaging is essential for diagnosing various kidney diseases.
- Different contrast phases and scanning techniques may impact diagnostic accuracy.
Purpose of the Study:
- To evaluate the diagnostic value and limitations of precontrast, bolus-enhanced spiral, and delayed postcontrast renal CT scans.
- To determine the optimal CT imaging protocol for renal disease evaluation.
Main Methods:
- Retrospective analysis of renal CT scans from 85 patients.
- Comparison of diagnostic yield across three imaging series: precontrast, bolus-enhanced spiral, and delayed postcontrast CT.
- Assessment of lesion detection, vascularity, and anatomical detail.
Main Results:
- Precontrast scans effectively detected renal calcifications (18%), often obscured by contrast.
- Bolus-enhanced spiral CT and delayed postcontrast scans showed equal diagnostic yield (94%) for renal lesions.
- Bolus-enhanced spiral CT excelled in assessing lesion vascularity and renal artery/vein opacification (95%/85%).
- Delayed scans were vital for delineating medullary/parapelvic cysts and renal pelvis abnormalities (17%).
Conclusions:
- Routine renal CT should include precontrast and delayed postcontrast spiral scans.
- Bolus-enhanced spiral scans are recommended for evaluating renal vein vascularity and lesion vascularity.
- A combination of imaging techniques optimizes renal lesion detection and characterization.