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The dosimetric impact of including the patient table in CT dose estimates
KTH, Skolan för teknikvetenskap (SCI), Fysik.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 62, nr 23, s. N538-N547Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

he 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.

sted, utgiver, år, opplag, sider
IOP PUBLISHING LTD , 2017. Vol. 62, nr 23, s. N538-N547
Emneord [en]
computed tomography, patient table, dosimetry, Monte Carlo, patient dose
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-224075DOI: 10.1088/1361-6560/aa9259ISI: 000425833200001PubMedID: 28994662Scopus ID: 2-s2.0-85038213087OAI: oai:DiVA.org:kth-224075DiVA, id: diva2:1190490
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QC 20180314

Tilgjengelig fra: 2018-03-14 Laget: 2018-03-14 Sist oppdatert: 2018-03-14bibliografisk kontrollert

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