Organ and effective doses from verification techniques in image-guided radiotherapy

Dufek, V.; Horakova, I.; Novák, L.

doi:10.1093/rpd/ncr335

Cited by 11 publications

(10 citation statements)

References 6 publications

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“…The influence of new scan protocols that were released with new software versions (i.e. upgraded versions) on image quality and patient doses have been investigated in several studies (Palm et al, 2010, Ding et al, 2010, Dufek et al, 2011, Ding and Munro, 2013. These studies showed that the default scan protocols implemented in new versions usually played a role in improving the image quality and minimizing organ and effective doses.…”

Section: Influence Of the Scan Parametersmentioning

confidence: 99%

A Monte Carlo study of organ and effective doses of cone beam computed tomography (CBCT) scans in radiotherapy

2017

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Cone-beam CT (CBCT) scans utilised for image guided radiation therapy (IGRT) procedures have become an essential part of radiotherapy. The aim of this study was to assess organ and effective doses resulting from new CBCT scan protocols (head, thorax, and pelvis) released with a software upgrade of the kV on-board-imager (OBI) system. Organ and effective doses for protocols of the new software (V2.5) and a previous version (V1.6) were assessed using Monte Carlo (MC) simulations for the International Commission on Radiological Protection (ICRP) adult male and female reference computational phantoms. The number of projections and the mAs values were increased and the size of the scan field was extended in the new protocols. Influence of these changes on organ and effective doses of the scans was investigated. The OBI system was modelled in EGSnrc/BEAMnrc, and organ doses were estimated using EGSnrc/DOSXYZnrc. The MC model was benchmarked against experimental measurements. Organ doses resulting from the V2.5 protocols were higher than those of V1.6 for organs that were partially or fully inside the scans fields, and increased by (3-13)%, (10-77)%, and (13-21)% for the head, thorax, and pelvis protocols for both phantoms, respectively. As a result, effective doses rose by 14%, 17%, and 16% for the male phantom, and 13%, 18%, and 17% for the female phantom for the three scan protocols, respectively. The scan field extension for the V2.5 protocols contributed significantly in the dose increases, especially for organs that were partially irradiated such as the thyroid in head and thorax scans and colon in the pelvic scan. The contribution of the mAs values and projection numbers was minimal in the dose increases, up to 2.5%. The field size extension plays a major role in improving the treatment output by including more markers in the field of view to match between CBCT and CT images and hence setting up the patient precisely. Therefore, a trade-off between the risk and benefits of CBCT scans should be considered, and the dose increases should be monitored. Several recommendations have been made for optimisation of the patient dose involved for IGRT procedures.

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Section: Influence Of the Scan Parametersmentioning

confidence: 99%

A Monte Carlo study of organ and effective doses of cone beam computed tomography (CBCT) scans in radiotherapy

2017

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“…Several studies reported on the effective doses from kilovoltage CBCT [6,31,33,34,39,43,90]. In all these cases, the absorbed dose was measured in an anthropomorphic phantom and converted to effective dose using the tissue weighting factors obtained from International Commission on Radiological Protection (ICRP) reports 60 and 103 [91,92].…”

Section: Estimation Of Effective Dose From Cbct Imagingmentioning

confidence: 99%

Imaging dose from cone beam computed tomography in radiation therapy

2015

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Imaging dose in radiation therapy has traditionally been ignored due to its low magnitude and frequency in comparison to therapeutic dose used to treat patients. The advent of modern, volumetric, imaging modalities, often as an integral part of linear accelerators, has facilitated the implementation of image-guided radiation therapy (IGRT), which is often accomplished by daily imaging of patients. Daily imaging results in additional dose delivered to patient that warrants new attention be given to imaging dose. This review summarizes the imaging dose delivered to patients as the result of cone beam computed tomography (CBCT) imaging performed in radiation therapy using current methods and equipment. This review also summarizes methods to calculate the imaging dose, including the use of Monte Carlo (MC) and treatment planning systems (TPS). Peripheral dose from CBCT imaging, dose reduction methods, the use of effective dose in describing imaging dose, and the measurement of CT dose index (CTDI) in CBCT systems are also reviewed.

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“…W tabeli 1 przedstawiono podsumowanie wybranych monografii naukowych na temat dawek pochodzących z obrazowania metodą kV-CBCT [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Dodatkowo w tabeli 2 wyszczególniono otrzymane wyniki dla poszczególnych narządów, które znaleźć można w publikacji M.W.…”

Section: Szacowane Dawki Dla Wybranych Protokołów Obrazowaniaunclassified

“…Dawki pochodzące z obrazowania metodą kV-CBCT raportowane w publikacjach naukowych, w których wykorzystano fantom antropomorficzny. Opracowano na podstawie[14][15][16][17][18][19][20][21][22][23][24][25][26][27].Kinga Graczyk , Marta Kruszyna-Mochalska / Zeszyty Naukowe WCO, Letters in Oncology Science 2022;19(1):97-104 100…”

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Dawki pochodzące z obrazowania w radioterapii sterowanej obrazem

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Kruszyna-Mochalska

2022

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Współczesnym złotym standardem leczenia nowotworów z wykorzystaniem radioterapii, jest wykorzystanie do pozycjonowania pacjenta na stole terapeutycznym, obrazowania wiązką promieniowania jonizującego o kilowoltowym lub megawoltowym efektywnym potencjale przyspieszającym - wobec tego pacjent narażony jest na dodatkową dawkę. Zgodnie z zasadą ALARA, ważne jest, aby osiągnąć pożądany efekt kliniczny przy zastosowaniu możliwie najmniejszej dawki promieniowania i odnosi się to również do obrazowania. Celem poniższego artykułu była analiza problemu jakim jest szacowanie poziomu dawek pochodzących z obrazowania różnymi technikami w radioterapii sterowanej obrazem (ang. Image-Guided Radiation Therapy - IGRT).

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Organ and effective doses from verification techniques in image-guided radiotherapy

Cited by 11 publications

References 6 publications

A Monte Carlo study of organ and effective doses of cone beam computed tomography (CBCT) scans in radiotherapy

A Monte Carlo study of organ and effective doses of cone beam computed tomography (CBCT) scans in radiotherapy

Imaging dose from cone beam computed tomography in radiation therapy

Dawki pochodzące z obrazowania w radioterapii sterowanej obrazem

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