Embryo Dose Estimates in Body CT

Huda, Walter; Randazzo, William; Tipnis, Sameer; Frey, G. Donald; Mah, Eugene

doi:10.2214/ajr.09.4032

Cited by 45 publications

(15 citation statements)

References 23 publications

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“…The latter approach, first proposed by Huda et al [21], provides an accurate and practical approximation of organ doses for comparisons between CT scanners and protocols. For example, given a hypothetical organ dose of 10 mGy and CTDI vol of 15 mGy for the protocol that delivered this dose, the percentage CTDI vol would be 10 / 15 = 0.67%.…”

Section: Ct Protocolsmentioning

confidence: 99%

Female Breast, Lung, and Pelvic Organ Radiation From Dose-Reduced 64-MDCT Thoracic Examination Protocols: A Phantom Study

Litmanovich

Tack²,

Lin

et al. 2011

American Journal of Roentgenology

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Section: Ct Protocolsmentioning

confidence: 99%

Female Breast, Lung, and Pelvic Organ Radiation From Dose-Reduced 64-MDCT Thoracic Examination Protocols: A Phantom Study

Litmanovich

Tack²,

Lin

et al. 2011

American Journal of Roentgenology

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“…11,12 As a result, the reported CTDI vol -to-organ-dose conversion coefficients were valid only for that specific scan protocol and patient model. Several investigators [13][14][15][16] have demonstrated that patient size has a significant effect on the absorbed dose and, even more specifically, on organ dose for a specific scanner output ͑e.g., CTDI vol ͒. These reports have all shown that for the same exposure conditions ͑i.e., same technical parameter settings͒, organs in smaller patients ͑including pediatric patients͒ receive higher radiation doses than those in larger patients.…”

Section: Introductionmentioning

confidence: 99%

The feasibility of patient size‐corrected, scanner‐independent organ dose estimates for abdominal CT exams

et al. 2011

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Purpose:A recent work has demonstrated the feasibility of estimating the dose to individual organs from multidetector CT exams using patient-specific, scanner-independent CTDI vol -to-organ-dose conversion coefficients. However, the previous study only investigated organ dose to a single patient model from a full-body helical CT scan. The purpose of this work was to extend the validity of this dose estimation technique to patients of any size undergoing a common clinical exam. This was done by determining the influence of patient size on organ dose conversion coefficients generated for typical abdominal CT exams. Methods: Monte Carlo simulations of abdominal exams were performed using models of 64-slice MDCT scanners from each of the four major manufacturers to obtain dose to radiosensitive organs for eight patient models of varying size, age, and gender. The scanner-specific organ doses were normalized by corresponding CTDI vol values and averaged across scanners to obtain scannerindependent CTDI vol -to-organ-dose conversion coefficients for each patient model. In order to obtain a metric for patient size, the outer perimeter of each patient was measured at the central slice of the abdominal scan region. Then, the relationship between CTDI vol -to-organ-dose conversion coefficients and patient perimeter was investigated for organs that were directly irradiated by the abdominal scan. These included organs that were either completely ͑"fully irradiated"͒ or partly ͑"partially irradiated"͒ contained within the abdominal exam region. Finally, dose to organs that were not at all contained within the scan region ͑"nonirradiated"͒ were compared to the doses delivered to fully irradiated organs. Results: CTDI vol -to-organ-dose conversion coefficients for fully irradiated abdominal organs had a strong exponential correlation with patient perimeter. Conversely, partially irradiated organs did not have a strong dependence on patient perimeter. In almost all cases, the doses delivered to nonirradiated organs were less than 5%, on average across patient models, of the mean dose of the fully irradiated organs. Conclusions: This work demonstrates the feasibility of calculating patient-specific, scannerindependent CTDI vol -to-organ-dose conversion coefficients for fully irradiated organs in patients undergoing typical abdominal CT exams. A method to calculate patient-specific, scanner-specific, and exam-specific organ dose estimates that requires only knowledge of the CTDI vol for the scan protocol and the patient's perimeter is thus possible. This method will have to be extended in future 820 820 Med. Phys. 38 "2…,

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“…The CT dose index volume is roughly equal to the fetal dose in this patient. 2,3 The American College of Radiology's CT accreditation reference CTDI vol in abdominal CT is 25 mGy, which corresponds to an embryo dose of B35 mGy in a 70-kg patient. Thus, our fetal dose was within acceptable limits.…”

Section: Denouement and Discussionmentioning

confidence: 99%

Thanatophoric dysplasia, type I

Herman

Siegel

2012

J Perinatol

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Embryo Dose Estimates in Body CT

Abstract: Embryo doses can be estimated using relative uterus doses, normalized plateau uterus doses, and CTDI(vol) data with correction factors for patient size.

Cited by 45 publications

References 23 publications

Female Breast, Lung, and Pelvic Organ Radiation From Dose-Reduced 64-MDCT Thoracic Examination Protocols: A Phantom Study

Female Breast, Lung, and Pelvic Organ Radiation From Dose-Reduced 64-MDCT Thoracic Examination Protocols: A Phantom Study

The feasibility of patient size‐corrected, scanner‐independent organ dose estimates for abdominal CT exams

Thanatophoric dysplasia, type I

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