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Radiation dose for routine clinical adult brain CT: Variability on different scanners at one institution.

Publication ,  Journal Article
Jaffe, TA; Hoang, JK; Yoshizumi, TT; Toncheva, G; Lowry, C; Ravin, C
Published in: AJR Am J Roentgenol
August 2010

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.

Duke Scholars

Published In

AJR Am J Roentgenol

DOI

EISSN

1546-3141

Publication Date

August 2010

Volume

195

Issue

2

Start / End Page

433 / 438

Location

United States

Related Subject Headings

  • Tomography, X-Ray Computed
  • Sensitivity and Specificity
  • Reproducibility of Results
  • Radiometry
  • Radiation Dosage
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Male
  • Humans
  • Equipment Failure Analysis
 

Citation

APA
Chicago
ICMJE
MLA
NLM
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 Am J Roentgenol, 195(2), 433–438. https://doi.org/10.2214/AJR.09.3957
Jaffe, Tracy A., Jenny K. Hoang, Terry T. Yoshizumi, Greta Toncheva, Carolyn Lowry, and Carl Ravin. “Radiation dose for routine clinical adult brain CT: Variability on different scanners at one institution.AJR Am J Roentgenol 195, no. 2 (August 2010): 433–38. https://doi.org/10.2214/AJR.09.3957.
Jaffe TA, Hoang JK, Yoshizumi TT, Toncheva G, Lowry C, Ravin C. 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.
Jaffe, Tracy A., et al. “Radiation dose for routine clinical adult brain CT: Variability on different scanners at one institution.AJR Am J Roentgenol, vol. 195, no. 2, Aug. 2010, pp. 433–38. Pubmed, doi:10.2214/AJR.09.3957.
Jaffe TA, Hoang JK, Yoshizumi TT, Toncheva G, Lowry C, Ravin C. Radiation dose for routine clinical adult brain CT: Variability on different scanners at one institution. AJR Am J Roentgenol. 2010 Aug;195(2):433–438.

Published In

AJR Am J Roentgenol

DOI

EISSN

1546-3141

Publication Date

August 2010

Volume

195

Issue

2

Start / End Page

433 / 438

Location

United States

Related Subject Headings

  • Tomography, X-Ray Computed
  • Sensitivity and Specificity
  • Reproducibility of Results
  • Radiometry
  • Radiation Dosage
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Male
  • Humans
  • Equipment Failure Analysis