KERMA ratios in pediatric CT dosimetry

Huda, Walter; Ogden, Kent M.; Lavallee, R. L.; Roskopf, M; Scalzetti, Ernest M.

doi:10.1007/s00247-011-2336-4

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…The accuracy of the estimate is significantly affected by the child's size and the radiation output of the scanner [1]. A qualified medical physicist should verify the radiation output of the CT scanner before either method of dose estimation is employed.…”

Section: Strengths and Weaknessesmentioning

confidence: 99%

“…This issue of Pediatric Radiology includes a paper titled "KERMA Ratios in Pediatric CT Dosimetry" [1] that presents a method to estimate organ doses in pediatric CT patients. In 2011, the American Association of Physicists in Medicine (AAPM) published a different approach to estimating pediatric radiation doses associated with CT scanning [2].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

KERMA ratios vs. SSDE: is one better at estimating pediatric CT radiation doses?

Strauss

2012

Pediatr Radiol

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Section: Strengths and Weaknessesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

KERMA ratios vs. SSDE: is one better at estimating pediatric CT radiation doses?

Strauss

2012

Pediatr Radiol

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CT Radiation Exposure: An Overview

Huda

2014

Curr Radiol Rep

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Doses Metrics and Patient Age in Ct

Huda

Tipnis

2015

Radiat Prot Dosimetry

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The aim of this study was to investigate how effective dose and size-specific dose estimate (SSDE) change with patient age (size) for routine head and abdominal/pelvic CT examinations. Heads and abdomens of patients were modelled as a mass-equivalent cylinder of water corresponding to the patient 'effective diameter'. Head CT scans were performed at CTDIvol(S) of 40 mGy, and abdominal CT scans were performed at CTDIvol(L) of 10 mGy. Values of SSDE were obtained using conversion factors in AAPM Task Group Report 204. Age-specific scan lengths for head and abdominal CT scans obtained from the authors' clinical practice were used to estimate the dose-length product for each CT examination. Effective doses were calculated from previously published age- and sex-specific E/DLP conversion factors, based on ICRP 103 organ-weighting factors. For head CT examinations, the scan length increased from 15 cm in a newborn to 20 cm in adults, and for an abdominal/pelvic CT, the scan length increased from 20 cm in a newborn to 45 cm in adults. For head CT scans, SSDE ranged from 37.2 mGy in adults to 48.8 mGy in a newborn, an increase of 31 %. The corresponding head CT effective doses range from 1.4 mSv in adults to 5.2 mSv in a newborn, an increase of 270 %. For abdomen CT scans, SSDE ranged from 13.7 mGy in adults to 23.0 mGy in a newborn, an increase of 68 %. The corresponding abdominal CT effective doses ranged from 6.3 mSv in adults to 15.4 mSv in a newborn, an increase of 140 %. SSDE increases much less than effective dose in paediatric patients compared with adults because it does not account for scan length or scattered radiation. Size- and age-specific effective doses better quantify the total radiation received by patients in CT by explicitly accounting for all organ doses, as well as their relative radio sensitivity.

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KERMA ratios in pediatric CT dosimetry

Abstract: KERMA ratios may be combined with air KERMA measurements at the isocenter to estimate organ doses in pediatric CT patients.

Cited by 3 publications

References 20 publications

KERMA ratios vs. SSDE: is one better at estimating pediatric CT radiation doses?

KERMA ratios vs. SSDE: is one better at estimating pediatric CT radiation doses?

CT Radiation Exposure: An Overview

Doses Metrics and Patient Age in Ct

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