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Influence of localizer and scan direction on the dose-reducing effect of automatic tube current modulation in computed tomography

Caro Franck (UGent) and Klaus Bacher (UGent)
(2016) RADIATION PROTECTION DOSIMETRY. 169(1-4). p.136-142
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Abstract
The purpose of this study was to investigate the influence of the localizer and scan direction on the dose-reducing efficacy of the automatic tube current modulation (ATCM) in computed tomography (CT). Craniocaudal and caudocranial chest CT scans, based on anterior-posterior (AP), posterior-anterior (PA), lateral (LAT) or dual AP/LAT localizers, of an anthropomorphic phantom containing thermoluminescent dosimeters (TLDs), were made on three Siemens systems. TLD readings were converted to lung and thyroid doses. A second dose estimation was performed based on Monte Carlo simulations. In addition, the ATCM behaviour of GE and Toshiba was evaluated based on AP, PA and LAT localizers. Compared with AP, tube currents of PA and AP/LAT scans were on average 20 % higher and 40 % lower, respectively, for the Siemens systems. Consequently, thyroid and lung doses increased with 60 % with a PA instead of an AP/ LAT scan, with significant differences in image noise. Moreover, the thyroid dose halves by taking the scan in caudocranial direction. Noise values were not significantly different when changing scan direction.
Keywords
MONTE-CARLO TOOL, CURRENT CT, REDUCTION, ATTENUATION, VALIDATION, PATIENT, PHANTOM, SIMULATION, ABDOMEN, PELVIS

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Citation

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Chicago
Franck, Caro, and Klaus Bacher. 2016. “Influence of Localizer and Scan Direction on the Dose-reducing Effect of Automatic Tube Current Modulation in Computed Tomography.” Radiation Protection Dosimetry 169 (1-4): 136–142.
APA
Franck, C., & Bacher, K. (2016). Influence of localizer and scan direction on the dose-reducing effect of automatic tube current modulation in computed tomography. RADIATION PROTECTION DOSIMETRY, 169(1-4), 136–142.
Vancouver
1.
Franck C, Bacher K. Influence of localizer and scan direction on the dose-reducing effect of automatic tube current modulation in computed tomography. RADIATION PROTECTION DOSIMETRY. 2016;169(1-4):136–42.
MLA
Franck, Caro, and Klaus Bacher. “Influence of Localizer and Scan Direction on the Dose-reducing Effect of Automatic Tube Current Modulation in Computed Tomography.” RADIATION PROTECTION DOSIMETRY 169.1-4 (2016): 136–142. Print.
@article{8518162,
  abstract     = {The purpose of this study was to investigate the influence of the localizer and scan direction on the dose-reducing efficacy of the automatic tube current modulation (ATCM) in computed tomography (CT). Craniocaudal and caudocranial chest CT scans, based on anterior-posterior (AP), posterior-anterior (PA), lateral (LAT) or dual AP/LAT localizers, of an anthropomorphic phantom containing thermoluminescent dosimeters (TLDs), were made on three Siemens systems. TLD readings were converted to lung and thyroid doses. A second dose estimation was performed based on Monte Carlo simulations. In addition, the ATCM behaviour of GE and Toshiba was evaluated based on AP, PA and LAT localizers. Compared with AP, tube currents of PA and AP/LAT scans were on average 20 \% higher and 40 \% lower, respectively, for the Siemens systems. Consequently, thyroid and lung doses increased with 60 \% with a PA instead of an AP/ LAT scan, with significant differences in image noise. Moreover, the thyroid dose halves by taking the scan in caudocranial direction. Noise values were not significantly different when changing scan direction.},
  author       = {Franck, Caro and Bacher, Klaus},
  issn         = {0144-8420},
  journal      = {RADIATION PROTECTION DOSIMETRY},
  keyword      = {MONTE-CARLO TOOL,CURRENT CT,REDUCTION,ATTENUATION,VALIDATION,PATIENT,PHANTOM,SIMULATION,ABDOMEN,PELVIS},
  language     = {eng},
  number       = {1-4},
  pages        = {136--142},
  title        = {Influence of localizer and scan direction on the dose-reducing effect of automatic tube current modulation in computed tomography},
  url          = {http://dx.doi.org/10.1093/rpd/ncw077},
  volume       = {169},
  year         = {2016},
}

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