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The dosimetric impact of including the patient table in CT dose estimates
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
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2017 (English)In: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 62, no 23, p. 538-547Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was to evaluate the dosimetric impact of including the patient table in Monte Carlo CT dose estimates for both spiral scans and scan projection radiographs (SPR). CT scan acquisitions were simulated for a Siemens SOMATOM Force scanner (Siemens Healthineers, Forchheim, Germany) with and without a patient table present. An adult male, an adult female and a pediatric female voxelized phantom were simulated. The simulated scans included tube voltages of 80 and 120 kVp. Spiral scans simulated without a patient table resulted in effective doses that were overestimated by approximately 5 % compared to the same simulations performed with the patient table present. Doses in selected individual organs (breast, colon, lung, red bone marrow and stomach) were overestimated by up to 8 %. Effective doses from SPR acquired with the X-ray tube stationary at 6 o'clock (posterior-anterior) were overestimated by 14-23 % when the patient table was not included, with individual organ dose discrepancies (breast, colon, lung red bone marrow and stomach) all exceeding 13%. The reference entrance skin dose to the back were in this situation overestimated by 6-15 %. These results highlight the importance of including the patient table in patient dose estimates for such scan situations.

Place, publisher, year, edition, pages
2017. Vol. 62, no 23, p. 538-547
Keywords [en]
Monte Carlo, computed tomography, dosimetry, patient dose, patient table
National Category
Other Physics Topics
Research subject
radiofysik
Identifiers
URN: urn:nbn:se:umu:diva-140510DOI: 10.1088/1361-6560/aa9259ISI: 000425833200001PubMedID: 28994662OAI: oai:DiVA.org:umu-140510DiVA, id: diva2:1148874
Available from: 2017-10-12 Created: 2017-10-12 Last updated: 2018-06-09Bibliographically approved

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Andersson, Jonas

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CiteExportLink to record
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Citation style
  • apa
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