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Radiation doses from small-bowel follow-through and abdominopelvic MDCT in Crohn's disease.
AJR Am J Roentgenol. 2007 Nov; 189(5):1015-22.AA

Abstract

OBJECTIVE

The purpose of our study was to compare organ and effective doses for small-bowel follow-through (SBFT) and abdominopelvic MDCT in adults with Crohn's disease, to retrospectively evaluate the number of radiographic examinations performed for Crohn's disease indications, and to identify those patients undergoing serial examinations to better delineate the use of radiology in the diagnosis and clinical management of Crohn's disease.

MATERIALS AND METHODS

Using an anthropomorphic phantom and metal-oxide semiconductor field-effect transistor (MOSFET) dosimeters, specific organ doses were measured for 5 minutes of continuous fluoroscopy (kVp, 120; mA, 0.6) of each of the following: right lower quadrant, central abdomen, and pelvis. Effective doses were determined based on International Commission on Radiological Protection (ICRP) 60 weighting factors. Organ and effective doses were determined for abdominal and pelvic 16-MDCT: detector configuration, 16 x 0.625 mm; pitch, 1.75; 17.5 mm per rotation; rotation time, 0.5 second; 140 kVp; 340 mA. Electronic records were reviewed to determine the number of patients imaged for Crohn's disease indications and the number of studies per patient.

RESULTS

The highest fluoroscopic organ doses were as follows: in the right lower quadrant, right kidney (0.78 cGy) and marrow (0.66 cGy); in the central abdomen, kidneys (1.5 and 1.6 cGy) and marrow (0.76 cGy); and in the pelvis, marrow (0.67-0.95 cGy). Effective doses for the right lower quadrant, central abdomen, and pelvis were 1.37, 2.02, and 3.83 mSv, respectively. For MDCT, the highest organ doses were to the liver (2.95-3.33 cGy). The effective dose for abdominopelvic MDCT was 16.1 mSv. Three hundred seventy-three patients underwent imaging for Crohn's disease. The average number of SBFT and CT examinations was 1.8 and 2.3, respectively. Thirty-four (9%) of 373 patients underwent more than five CT examinations and 11 (3%) had more than 10.

CONCLUSION

Organ and effective doses are up to five times higher with MDCT than with SBFT. Crohn's disease is more frequently imaged with CT. For a subset of patients who undergo numerous CT examinations, efforts should be made to minimize the number of CT examinations, decrease the CT dose, or consider MR enterography.

Authors+Show Affiliations

Department of Radiology, Duke University Medical Center, Erwin Rd., Box 3808, Durham, NC 27710, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17954634

Citation

Jaffe, Tracy A., et al. "Radiation Doses From Small-bowel Follow-through and Abdominopelvic MDCT in Crohn's Disease." AJR. American Journal of Roentgenology, vol. 189, no. 5, 2007, pp. 1015-22.
Jaffe TA, Gaca AM, Delaney S, et al. Radiation doses from small-bowel follow-through and abdominopelvic MDCT in Crohn's disease. AJR Am J Roentgenol. 2007;189(5):1015-22.
Jaffe, T. A., Gaca, A. M., Delaney, S., Yoshizumi, T. T., Toncheva, G., Nguyen, G., & Frush, D. P. (2007). Radiation doses from small-bowel follow-through and abdominopelvic MDCT in Crohn's disease. AJR. American Journal of Roentgenology, 189(5), 1015-22.
Jaffe TA, et al. Radiation Doses From Small-bowel Follow-through and Abdominopelvic MDCT in Crohn's Disease. AJR Am J Roentgenol. 2007;189(5):1015-22. PubMed PMID: 17954634.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Radiation doses from small-bowel follow-through and abdominopelvic MDCT in Crohn's disease. AU - Jaffe,Tracy A, AU - Gaca,Ana Maria, AU - Delaney,Susan, AU - Yoshizumi,Terry T, AU - Toncheva,Greta, AU - Nguyen,Giao, AU - Frush,Donald P, PY - 2007/10/24/pubmed PY - 2007/12/6/medline PY - 2007/10/24/entrez SP - 1015 EP - 22 JF - AJR. American journal of roentgenology JO - AJR Am J Roentgenol VL - 189 IS - 5 N2 - OBJECTIVE: The purpose of our study was to compare organ and effective doses for small-bowel follow-through (SBFT) and abdominopelvic MDCT in adults with Crohn's disease, to retrospectively evaluate the number of radiographic examinations performed for Crohn's disease indications, and to identify those patients undergoing serial examinations to better delineate the use of radiology in the diagnosis and clinical management of Crohn's disease. MATERIALS AND METHODS: Using an anthropomorphic phantom and metal-oxide semiconductor field-effect transistor (MOSFET) dosimeters, specific organ doses were measured for 5 minutes of continuous fluoroscopy (kVp, 120; mA, 0.6) of each of the following: right lower quadrant, central abdomen, and pelvis. Effective doses were determined based on International Commission on Radiological Protection (ICRP) 60 weighting factors. Organ and effective doses were determined for abdominal and pelvic 16-MDCT: detector configuration, 16 x 0.625 mm; pitch, 1.75; 17.5 mm per rotation; rotation time, 0.5 second; 140 kVp; 340 mA. Electronic records were reviewed to determine the number of patients imaged for Crohn's disease indications and the number of studies per patient. RESULTS: The highest fluoroscopic organ doses were as follows: in the right lower quadrant, right kidney (0.78 cGy) and marrow (0.66 cGy); in the central abdomen, kidneys (1.5 and 1.6 cGy) and marrow (0.76 cGy); and in the pelvis, marrow (0.67-0.95 cGy). Effective doses for the right lower quadrant, central abdomen, and pelvis were 1.37, 2.02, and 3.83 mSv, respectively. For MDCT, the highest organ doses were to the liver (2.95-3.33 cGy). The effective dose for abdominopelvic MDCT was 16.1 mSv. Three hundred seventy-three patients underwent imaging for Crohn's disease. The average number of SBFT and CT examinations was 1.8 and 2.3, respectively. Thirty-four (9%) of 373 patients underwent more than five CT examinations and 11 (3%) had more than 10. CONCLUSION: Organ and effective doses are up to five times higher with MDCT than with SBFT. Crohn's disease is more frequently imaged with CT. For a subset of patients who undergo numerous CT examinations, efforts should be made to minimize the number of CT examinations, decrease the CT dose, or consider MR enterography. SN - 1546-3141 UR - https://www.unboundmedicine.com/medline/citation/17954634/Radiation_doses_from_small_bowel_follow_through_and_abdominopelvic_MDCT_in_Crohn's_disease_ L2 - https://www.ajronline.org/doi/10.2214/AJR.07.2427 DB - PRIME DP - Unbound Medicine ER -