A comparison study of size-specific dose estimate calculation methods.
Background: The size-specific dose estimate (SSDE) has emerged as an improved metric for use by medical physicists and radiologists for estimating individual patient dose. Several methods of calculating SSDE have been described, ranging from patient thickness or attenuation-based (automated and manu...
| Publicado en: | Pediatric Radiology Vol. 48; no. 1; pp. 56 - 66 |
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| Autores principales: | , , , , , , , |
| Formato: | research Journal Article |
| Publicado: |
Springer Nature
Jan2018
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=127041623&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 127041623 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 03010449 O03 jtl: Pediatric Radiology issn: 03010449 maglogo: N pubinfo: dt: Jan2018 vid: 48 iid: 1 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 127041623 127041623 144154472 NLM28951948 127041623 10.1007/s00247-017-3986-7 NLM28951948 127041623 ppf: 56 ppct: 10 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: A comparison study of size-specific dose estimate calculation methods. aug: au: Parikh, Roshni A. Wien, Michael A. Novak, Ronald D. Jordan, David W. Klahr, Paul Soriano, Stephanie Ciancibello, Leslie Berlin, Sheila C. affil: Department of Radiology, Rainbow Babies and Children’s Hospital, University Hospitals Cleveland Medical Center, Case Western Reserve University School of Medicine, 11100 Euclid Ave., 44106, Cleveland, OH, USA sug: subj: Tomography, X-Ray Computed Body Weight Algorithms Body Size Radiation Dosage Human Child Young Adult Child, Preschool Relative Risk Infant Retrospective Design Male Female Adolescence Validation Studies Comparative Studies Evaluation Research Multicenter Studies Child: 6-12 years Child, Preschool: 2-5 years Infant: 1-23 months Adolescent: 13-18 years Male Female ab: Background: The size-specific dose estimate (SSDE) has emerged as an improved metric for use by medical physicists and radiologists for estimating individual patient dose. Several methods of calculating SSDE have been described, ranging from patient thickness or attenuation-based (automated and manual) measurements to weight-based techniques.Objective: To compare the accuracy of thickness vs. weight measurement of body size to allow for the calculation of the size-specific dose estimate (SSDE) in pediatric body CT.Materials and Methods: We retrospectively identified 109 pediatric body CT examinations for SSDE calculation. We examined two automated methods measuring a series of level-specific diameters of the patient's body: method A used the effective diameter and method B used the water-equivalent diameter. Two manual methods measured patient diameter at two predetermined levels: the superior endplate of L2, where body width is typically most thin, and the superior femoral head or iliac crest (for scans that did not include the pelvis), where body width is typically most thick; method C averaged lateral measurements at these two levels from the CT projection scan, and method D averaged lateral and anteroposterior measurements at the same two levels from the axial CT images. Finally, we used body weight to characterize patient size, method E, and compared this with the various other measurement methods. Methods were compared across the entire population as well as by subgroup based on body width.Results: Concordance correlation (ρc) between each of the SSDE calculation methods (methods A-E) was greater than 0.92 across the entire population, although the range was wider when analyzed by subgroup (0.42-0.99). When we compared each SSDE measurement method with CTDIvol, there was poor correlation, ρc<0.77, with percentage differences between 20.8% and 51.0%.Conclusion: Automated computer algorithms are accurate and efficient in the calculation of SSDE. Manual methods based on patient thickness provide acceptable dose estimates for pediatric patients <30 cm in body width. Body weight provides a quick and practical method to identify conversion factors that can be used to estimate SSDE with reasonable accuracy in pediatric patients with body width ≥20 cm. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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