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Radiation dose for routine clinical adult brain CT: Variability on different scanners at one institution.
AJR Am J Roentgenol. 2010 Aug; 195(2):433-8.AA

Abstract

OBJECTIVE

The purpose of this study was to determine, using an anthropomorphic phantom, whether patients are subject to variable radiation doses based on scanner assignment for routine CT of the brain.

MATERIALS AND METHODS

Twenty metal oxide semiconductor field effect transistor dosimeters were placed in the brain of a male anthropomorphic phantom scanned three times with a routine clinical brain CT protocol on four scanners from one manufacturer in four configurations and on one 64-MDCT scanner from another manufacturer. Absorbed organ doses were measured for skin, cranium, brain, lens of the eye, mandible, and thyroid. Effective dose was calculated on the basis of the dose-length product recorded on each scanner.

RESULTS

Organ dose ranges were as follows: cranium, 2.57-3.47 cGy; brain, 2.34-3.78 cGy; lens, 2.51-5.03 cGy; mandible 0.17-0.48 cGy; and thyroid, 0.03-0.28 cGy. Statistically significant differences between scanners with respect to dose were recorded for brain and lens (p < 0.05). Absorbed doses were lowest on the single-detector scanner. In the comparison of MDCT scanners, the highest doses were found on the 4-MDCT scanner and the dual-source 64-MDCT scanner not capable of gantry tilt. Effective dose ranged from 1.22 to 1.86 mSv.

CONCLUSION

According to the phantom data, patients are subject to different organ doses in the lens and brain depending on scanner assignment. At our institution with existing protocols, absorbed doses at brain CT are lowest with the single-detector CT scanner, followed by MDCT scanners capable of gantry tilt. On scanners without gantry tilt, CT of the brain should be performed with careful head positioning and shielding of the orbits. These precautions are especially true for patients who need repeated scanning and for pediatric patients.

Authors+Show Affiliations

Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA. jaffe002@mc.duke.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Evaluation Study
Journal Article

Language

eng

PubMed ID

20651201

Citation

Jaffe, Tracy A., et al. "Radiation Dose for Routine Clinical Adult Brain CT: Variability On Different Scanners at One Institution." AJR. American Journal of Roentgenology, vol. 195, no. 2, 2010, pp. 433-8.
Jaffe TA, Hoang JK, Yoshizumi TT, et al. Radiation dose for routine clinical adult brain CT: Variability on different scanners at one institution. AJR Am J Roentgenol. 2010;195(2):433-8.
Jaffe, T. A., Hoang, J. K., Yoshizumi, T. T., Toncheva, G., Lowry, C., & Ravin, C. (2010). Radiation dose for routine clinical adult brain CT: Variability on different scanners at one institution. AJR. American Journal of Roentgenology, 195(2), 433-8. https://doi.org/10.2214/AJR.09.3957
Jaffe TA, et al. Radiation Dose for Routine Clinical Adult Brain CT: Variability On Different Scanners at One Institution. AJR Am J Roentgenol. 2010;195(2):433-8. PubMed PMID: 20651201.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Radiation dose for routine clinical adult brain CT: Variability on different scanners at one institution. AU - Jaffe,Tracy A, AU - Hoang,Jenny K, AU - Yoshizumi,Terry T, AU - Toncheva,Greta, AU - Lowry,Carolyn, AU - Ravin,Carl, PY - 2010/7/24/entrez PY - 2010/7/24/pubmed PY - 2010/9/25/medline SP - 433 EP - 8 JF - AJR. American journal of roentgenology JO - AJR Am J Roentgenol VL - 195 IS - 2 N2 - OBJECTIVE: The purpose of this study was to determine, using an anthropomorphic phantom, whether patients are subject to variable radiation doses based on scanner assignment for routine CT of the brain. MATERIALS AND METHODS: Twenty metal oxide semiconductor field effect transistor dosimeters were placed in the brain of a male anthropomorphic phantom scanned three times with a routine clinical brain CT protocol on four scanners from one manufacturer in four configurations and on one 64-MDCT scanner from another manufacturer. Absorbed organ doses were measured for skin, cranium, brain, lens of the eye, mandible, and thyroid. Effective dose was calculated on the basis of the dose-length product recorded on each scanner. RESULTS: Organ dose ranges were as follows: cranium, 2.57-3.47 cGy; brain, 2.34-3.78 cGy; lens, 2.51-5.03 cGy; mandible 0.17-0.48 cGy; and thyroid, 0.03-0.28 cGy. Statistically significant differences between scanners with respect to dose were recorded for brain and lens (p < 0.05). Absorbed doses were lowest on the single-detector scanner. In the comparison of MDCT scanners, the highest doses were found on the 4-MDCT scanner and the dual-source 64-MDCT scanner not capable of gantry tilt. Effective dose ranged from 1.22 to 1.86 mSv. CONCLUSION: According to the phantom data, patients are subject to different organ doses in the lens and brain depending on scanner assignment. At our institution with existing protocols, absorbed doses at brain CT are lowest with the single-detector CT scanner, followed by MDCT scanners capable of gantry tilt. On scanners without gantry tilt, CT of the brain should be performed with careful head positioning and shielding of the orbits. These precautions are especially true for patients who need repeated scanning and for pediatric patients. SN - 1546-3141 UR - https://www.unboundmedicine.com/medline/citation/20651201/Radiation_dose_for_routine_clinical_adult_brain_CT:_Variability_on_different_scanners_at_one_institution_ L2 - http://www.ajronline.org/doi/full/10.2214/AJR.09.3957 DB - PRIME DP - Unbound Medicine ER -