Evaluation of different 16-row CT colonography protocols using a porcine model

RöFo : Fortschritte auf dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
O LuzC D Claussen

Abstract

To develop and to test an easily produced biological colon model with simulated polypoid lesions. Application of this phantom for the selection of an optimized scan protocol of 16-row CT colonography (CTC) for clinical use. Six polypoid lesions (1 - 6 mm) were simulated with sutures on the inner face of a porcine colon segment (20 cm). After distending the colon segment with air, the phantom was placed in a water quench and CT scans were performed on a MDCT-scanner (Somatom Sensation 16, Siemens, Forchheim). At constant values for collimation (16x0.75 mm) and voltage (120 kV), 54 different combinations of mAs values (50, 75 and 100 mAs), pitch factors (1, 1.25 and 1.5) and slice thicknesses (0.75, 1.0, 1.5, 2.0, 3.0 and 5.0 mm) were tested systematically. The phantom was scanned in the longitudinal and transverse axis to simulate the different orientation of the colon in the abdomen. Axial slice images and virtual endoscopic views of all data sets were presented separately to 2 radiologists who independently determined number and size of detectable polyps. Dose exposure was measured with an Alderson phantom. The colon model offered a realistic imitation of a polyp-covered, human colon. The experimental set-up allowed a systemat...Continue Reading

Citations

Feb 8, 2007·European Radiology·O LuzM Heuschmid
Aug 25, 2006·AJR. American Journal of Roentgenology·A GraserC R Becker

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