Optimization of 64-MDCT urography: effect of dual-phase imaging with furosemide on collecting system opacification and radiation dose.
OBJECTIVE
The purpose of this study was to compare opacification of the urinary collecting system and radiation dose associated with three-phase 64-MDCT urographic protocols and those associated with a split-bolus dual-phase protocol including furosemide.


METHODS
Images from 150 CT urographic examinations performed with three scanning protocols were retrospectively evaluated. Group A consisted of 50 sequentially registered patients who underwent a three-phase protocol with saline infusion. Group B consisted of 50 sequentially registered patients who underwent a reduced-radiation three-phase protocol with saline. Group C consisted of 50 sequentially registered patients who underwent a dual-phase split-bolus protocol that included a low-dose furosemide injection. Opacification of the urinary collecting system was evaluated with segmental binary scoring. Contrast artifacts were evaluated, and radiation doses were recorded. Results were compared by analysis of variance.


RESULTS
A significant reduction in mean effective radiation dose was found between groups A and B (p < 0.001) and between groups B and C (p < 0.001), resulting in 65% reduction between groups A and C (p < 0.001). This reduction did not significantly affect opacification score in any of the 12 urinary segments (p = 0.079). In addition, dense contrast artifacts overlying the renal parenchyma observed with the three-phase protocols (groups A and B) were avoided with the dual-phase protocol (group C) (p < 0.001).


CONCLUSIONS
A dual-phase protocol with furosemide injection is the preferable technique for CT urography. In comparison with commonly used three-phase protocols, the dual-phase protocol significantly reduces radiation exposure dose without reduction in image quality.
Diagnostic Imaging Department, Sheba Medical Center, Tel Aviv, Israel. orith.portnoy@sheba.health.gov.il
Orith
O
Portnoy
Larisa
L
Guranda
Sara
S
Apter
David
D
Eiss
Marianne Michal
MM
Amitai
Eli
E
Konen
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D016477:Artifacts; D004232:Diuretics; D005260:Female; D005665:Furosemide; D006801:Humans; D007479:Iopamidol / Q000031:analogs & derivatives*; D008297:Male; D008875:Middle Aged; D011829:Radiation Dosage; D012189:Retrospective Studies; D012965:Sodium Chloride; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014567:Urography / Q000379:methods*; D014570:Urologic Diseases / Q000000981:diagnostic imaging*
D004232:Diuretics; C057937:iomeprol; D012965:Sodium Chloride; D005665:Furosemide; D007479:Iopamidol