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Organ-based dose current modulation and thyroid shields: techniques of radiation dose reduction for neck CT.

Publication ,  Journal Article
Hoang, JK; Yoshizumi, TT; Choudhury, KR; Nguyen, GB; Toncheva, G; Gafton, AR; Eastwood, JD; Lowry, C; Hurwitz, LM
Published in: AJR Am J Roentgenol
May 2012

OBJECTIVE: The purpose of this study was to assess the difference in absorbed organ dose and image quality for MDCT neck protocols using automatic tube current modulation alone compared with organ-based dose modulation and in-plane thyroid bismuth shielding. MATERIALS AND METHODS: An anthropomorphic female phantom with metal oxide semiconductor field effect transistor (MOSFET) detectors was scanned on a 64-MDCT scanner. The protocols included a reference neck CT protocol using automatic tube current modulation and three modified protocols: organ-based dose modulation, automatic tube current modulation with thyroid shield, and organ-based dose modulation with thyroid shield. Image noise was evaluated quantitatively with the SD of the attenuation value, and subjectively by two neuroradiologists. RESULTS: Organ-based dose modulation, automatic tube current modulation with thyroid shield, and organ-based dose modulation with thyroid shield protocols reduced the thyroid dose by 28%, 33%, and 45%, respectively, compared with the use of automatic tube current modulation alone (p ≤ 0.005). Organ-based dose modulation also reduced the radiation dose to the ocular lens (33-47%) compared with the use of automatic tube current modulation (p ≤ 0.04). There was no significant difference in measured noise and subjective image quality between the protocols. CONCLUSION: Both organ-based dose modulation and thyroid shields significantly reduce the thyroid organ dose without degradation of subjective image quality compared with automatic tube current modulation. Organ-based dose modulation has the additional benefit of dose reduction to the ocular lens.

Duke Scholars

Published In

AJR Am J Roentgenol

DOI

EISSN

1546-3141

Publication Date

May 2012

Volume

198

Issue

5

Start / End Page

1132 / 1138

Location

United States

Related Subject Headings

  • Tomography, X-Ray Computed
  • Thyroid Gland
  • Software
  • Radiometry
  • Radiation Protection
  • Radiation Dosage
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Neck
  • Humans
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Hoang, J. K., Yoshizumi, T. T., Choudhury, K. R., Nguyen, G. B., Toncheva, G., Gafton, A. R., … Hurwitz, L. M. (2012). Organ-based dose current modulation and thyroid shields: techniques of radiation dose reduction for neck CT. AJR Am J Roentgenol, 198(5), 1132–1138. https://doi.org/10.2214/AJR.11.7445
Hoang, Jenny K., Terry T. Yoshizumi, Kingshuk Roy Choudhury, Giao B. Nguyen, Greta Toncheva, Andreia R. Gafton, James D. Eastwood, Carolyn Lowry, and Lynne M. Hurwitz. “Organ-based dose current modulation and thyroid shields: techniques of radiation dose reduction for neck CT.AJR Am J Roentgenol 198, no. 5 (May 2012): 1132–38. https://doi.org/10.2214/AJR.11.7445.
Hoang JK, Yoshizumi TT, Choudhury KR, Nguyen GB, Toncheva G, Gafton AR, et al. Organ-based dose current modulation and thyroid shields: techniques of radiation dose reduction for neck CT. AJR Am J Roentgenol. 2012 May;198(5):1132–8.
Hoang, Jenny K., et al. “Organ-based dose current modulation and thyroid shields: techniques of radiation dose reduction for neck CT.AJR Am J Roentgenol, vol. 198, no. 5, May 2012, pp. 1132–38. Pubmed, doi:10.2214/AJR.11.7445.
Hoang JK, Yoshizumi TT, Choudhury KR, Nguyen GB, Toncheva G, Gafton AR, Eastwood JD, Lowry C, Hurwitz LM. Organ-based dose current modulation and thyroid shields: techniques of radiation dose reduction for neck CT. AJR Am J Roentgenol. 2012 May;198(5):1132–1138.

Published In

AJR Am J Roentgenol

DOI

EISSN

1546-3141

Publication Date

May 2012

Volume

198

Issue

5

Start / End Page

1132 / 1138

Location

United States

Related Subject Headings

  • Tomography, X-Ray Computed
  • Thyroid Gland
  • Software
  • Radiometry
  • Radiation Protection
  • Radiation Dosage
  • Phantoms, Imaging
  • Nuclear Medicine & Medical Imaging
  • Neck
  • Humans