Abstract
Objective: To assess the effect of positive enteric contrast administration on automatic exposure control (AEC) CT radiation exposure in (1) a CT phantom, and (2) a retrospective review of patients. Materials and methods: We scanned a CT phantom containing simulated bowel that was sequentially filled with water and positive enteric contrast, and recorded the mean volume CT dose index (CTDIvol). We also identified 17 patients who had undergone 2 technically comparable CT scans of the abdomen and pelvis, one with positive enteric contrast and the other with oral water. Paired Student's t-tests were used to compare the mean CTDIvol between scans performed with and without positive enteric contrast. Both the phantom and patient CT scans were performed using AEC with a fixed noise index. Results: The mean CTDIvol for the phantom with simulated bowel containing water and positive enteric contrast were 8.2 ± 0.2 mGy, and 8.7 ± 0.1 mGy (6.1% higher than water, p = 0.02), respectively. The mean CTDIvol for patients scanned with oral water and with positive enteric contrast were 11.8 mGy and 13.1 mGy, respectively (p = 0.003). This corresponded to a mean CTDIvol which was 11.0% higher (range: 0.0-20.7% higher) in scans with positive enteric contrast than those with oral water in patients. Conclusions: When automatic exposure control is utilized for abdominopelvic CT, the radiation exposure, as measured by CTDIvol, is higher for scans performed with positive enteric contrast than those with oral water.
| Original language | English (US) |
|---|---|
| Journal | European Journal of Radiology |
| Volume | 79 |
| Issue number | 2 |
| DOIs | |
| State | Published - Aug 2011 |
| Externally published | Yes |
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Keywords
- Automatic exposure control
- CT
- Enteric contrast material
- Radiation exposure
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
Cite this
Positive enteric contrast material for abdominal and pelvic CT with automatic exposure control : What is the effect on patient radiation exposure? / Wang, Zhen J.; Chen, Katherine S.; Gould, Robert; Coakley, Fergus; Fu, Yanjun; Yeh, Benjamin M.
In: European Journal of Radiology, Vol. 79, No. 2, 08.2011.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Positive enteric contrast material for abdominal and pelvic CT with automatic exposure control
T2 - What is the effect on patient radiation exposure?
AU - Wang, Zhen J.
AU - Chen, Katherine S.
AU - Gould, Robert
AU - Coakley, Fergus
AU - Fu, Yanjun
AU - Yeh, Benjamin M.
PY - 2011/8
Y1 - 2011/8
N2 - Objective: To assess the effect of positive enteric contrast administration on automatic exposure control (AEC) CT radiation exposure in (1) a CT phantom, and (2) a retrospective review of patients. Materials and methods: We scanned a CT phantom containing simulated bowel that was sequentially filled with water and positive enteric contrast, and recorded the mean volume CT dose index (CTDIvol). We also identified 17 patients who had undergone 2 technically comparable CT scans of the abdomen and pelvis, one with positive enteric contrast and the other with oral water. Paired Student's t-tests were used to compare the mean CTDIvol between scans performed with and without positive enteric contrast. Both the phantom and patient CT scans were performed using AEC with a fixed noise index. Results: The mean CTDIvol for the phantom with simulated bowel containing water and positive enteric contrast were 8.2 ± 0.2 mGy, and 8.7 ± 0.1 mGy (6.1% higher than water, p = 0.02), respectively. The mean CTDIvol for patients scanned with oral water and with positive enteric contrast were 11.8 mGy and 13.1 mGy, respectively (p = 0.003). This corresponded to a mean CTDIvol which was 11.0% higher (range: 0.0-20.7% higher) in scans with positive enteric contrast than those with oral water in patients. Conclusions: When automatic exposure control is utilized for abdominopelvic CT, the radiation exposure, as measured by CTDIvol, is higher for scans performed with positive enteric contrast than those with oral water.
AB - Objective: To assess the effect of positive enteric contrast administration on automatic exposure control (AEC) CT radiation exposure in (1) a CT phantom, and (2) a retrospective review of patients. Materials and methods: We scanned a CT phantom containing simulated bowel that was sequentially filled with water and positive enteric contrast, and recorded the mean volume CT dose index (CTDIvol). We also identified 17 patients who had undergone 2 technically comparable CT scans of the abdomen and pelvis, one with positive enteric contrast and the other with oral water. Paired Student's t-tests were used to compare the mean CTDIvol between scans performed with and without positive enteric contrast. Both the phantom and patient CT scans were performed using AEC with a fixed noise index. Results: The mean CTDIvol for the phantom with simulated bowel containing water and positive enteric contrast were 8.2 ± 0.2 mGy, and 8.7 ± 0.1 mGy (6.1% higher than water, p = 0.02), respectively. The mean CTDIvol for patients scanned with oral water and with positive enteric contrast were 11.8 mGy and 13.1 mGy, respectively (p = 0.003). This corresponded to a mean CTDIvol which was 11.0% higher (range: 0.0-20.7% higher) in scans with positive enteric contrast than those with oral water in patients. Conclusions: When automatic exposure control is utilized for abdominopelvic CT, the radiation exposure, as measured by CTDIvol, is higher for scans performed with positive enteric contrast than those with oral water.
KW - Automatic exposure control
KW - CT
KW - Enteric contrast material
KW - Radiation exposure
UR - http://www.scopus.com/inward/record.url?scp=80052164775&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80052164775&partnerID=8YFLogxK
U2 - 10.1016/j.ejrad.2011.03.059
DO - 10.1016/j.ejrad.2011.03.059
M3 - Article
C2 - 21493028
AN - SCOPUS:80052164775
VL - 79
JO - European Journal of Radiology
JF - European Journal of Radiology
SN - 0720-048X
IS - 2
ER -