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Effects of oral contrast on dose in abdominopelvic computed tomography with pure iterative reconstruction

World Journal of Radiology 2016年第9期8卷 809-815页

作者： Kevin P Murphy Liam J Healy Lee Crush Maria Twomey Fiachra Moloney sylvia sexton Owen J O'Connor Michael M Maher Department of Radiology Cork University Hospital

AIM To assess the effect of neutral(NC) and positive(PC) oral contrast use on patient dose in low-dose abdominal computed tomography(CT).METHODS Low-dose clinically indicated CTs were performed on 79 Crohn's patients(35 = PC, 1 L 2% gastrografin; 44 = NC, 1.5 L polyethylene glycol). Scanner settings for both acquisitions were identical apart from 25 s difference in intravenous contrast timing. Body mass index(BMI), scan-ranges, dose-length product and size-specific dose estimated were recorded. Data was reconstructed with pure model-based iterative reconstruction. Image quality was objectively and subjectively analysed. Data analysis was performed with Statistical Package for Social *** Higher doses were seen in neutral contrast CTs(107.60 ± 78.7 m ***, 2.47 ± 1.21 m Gy vs 85.65 ± 58.2 m ***, 2.18 ± 0.96 m Gy). The differencehad both NC and PC investigations. Image-quality assessment yielded 6952 datapoints. NC image quality was significantly superior(P < 0.001)(objective noise, objective signal to noise ratio, subjective spatial resolution, subjective contrast resolution, diagnostic acceptability) at all levels. NC bowel distension was significantly(P < 0.001) *** The use of polyethylene glycol as a neutral OC agent leads to higher radiation doses than standard positive contrast studies, in low dose abdominal CT imaging. This is possibly related to the osmotic effect of the agent resulting in larger intraluminal fluid volumes and resultant increased overall beam attenuation.

关键词： Radiation dose Low dose computed tomography Abdominal imaging Oral contrast Computed tomography

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