Determination of the effective dose delivered by image guided radiotherapy in head &amp; neck and breast treatments

Conrad, Mireille; Bolard, G.; Nowak, Marie; Bari, Berardino De; Jeanneret‐Sozzi, Wendy; Bourhis, Jean; Germond, Jean‐François; Bochud, François; Moeckli, Raphaël

doi:10.1016/j.zemedi.2018.01.001

Cited by 5 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, the differences between the calculated values and the measured values (in the solid water and the heterogeneous phantom) were 0.5–2% in soft tissues, 2–5% in lung, and 2–12% in bone. These data are compatible with other studies (see Table for a comparison with reference). The maximal values were taken as the uncertainties in the effective dose calculation.…”

Section: Resultssupporting

confidence: 93%

“…The uncertainties are higher compared to previous results obtained for CBCT imaging doses (uncertainty of about 5%) . This is mainly due to the uncertainty related to the variability of the number of images (fixed by the protocol in CBCT) acquired during a treatment fraction as well as the multiples choices of the imaging isocenter (always fixed at the tumor center in CBCT).…”

Section: Discussionmentioning

confidence: 66%

“…There is no reference in the literature about the effective dose from IGRT for CyberKnife units. In order to put the results in perspective, Table II presents our results and the results obtained for CBCT IGRT protocols …”

Section: Resultsmentioning

confidence: 99%

“…A detailed description of effective dose calculation is presented in a previous publication. 14 The method is shortly summarized below (Fig. 2).…”

Section: E Dose Calculationmentioning

confidence: 99%

“…In order to put the results in perspective, Table II presents our results and the results obtained for CBCT IGRT protocols. 14 Table III presents the ESD calculated for pelvis cases with our CyberKnife IGRT X-ray beam model and the measured data found in the literature and Fig. 6 shows the relationship between the effective dose and the ESD calculated for our cohort of pelvic patients.…”

Section: D Organ Dose Effective Dose and Entrance Surface Dosementioning

confidence: 99%

See 4 more Smart Citations

Dose indicator for CyberKnife image‐guided radiation therapy

et al. 2020

Self Cite

View full text Add to dashboard Cite

Purpose: The purpose of this study was to calculate dose distributions from CyberKnife imageguided radiation therapy (IGRT) for brain, H&N, lung, and pelvis treatment regions and use them to extract the corresponding effective dose and estimate-related risk. Methods: We developed a CyberKnife IGRT kV beam model in a standard treatment planning system and validated it against measurements in heterogeneous phantoms. Five brain, five head and neck, five thorax, and 10 (five male and five female) pelvis patient computed tomographies (CTs) were contoured. The dose distribution resulting from different CyberKnife IGRT protocols was calculated. From them, the effective dose was calculated according to ICRP publication Nr 103, using the average dose to contoured organs. The corresponding risk factors were calculated. Entrance surface dose (ESD) was also calculated and compared with existing data. Results: The maximum effective dose produced by CyberKnife IGRT protocols was 0.8 mSv (brain), 1.9 mSv (H&N), 20.2 (pelvis), and 42.4 mSv (thorax) per fraction for a risk estimate of 0.004% (brain), 0.01% (H&N), 0.1% (pelvis), and 0.2% (thorax). Calculated ESD were compatible with existing data. Conclusions: Dose calculation models for CyberKnife IGRT kV beams were implemented in a clinical treatment planning system and validated in water and heterogeneous phantoms. We determined the effective dose and the related risk estimate resulting from CyberKnife IGRT protocols for brain, head and neck, thorax, and pelvis cases. The effective doses calculated for CyberKnife IGRT protocols were similar to those obtained for cone beam CT protocols on conventional C-arm linear accelerators, except for extreme irradiation conditions for thorax cases (140 kV X-ray tube tension).

show abstract

Section: Resultssupporting

confidence: 93%

Section: Discussionmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

“…A detailed description of effective dose calculation is presented in a previous publication. 14 The method is shortly summarized below (Fig. 2).…”

Section: E Dose Calculationmentioning

confidence: 99%

Section: D Organ Dose Effective Dose and Entrance Surface Dosementioning

confidence: 99%

See 3 more Smart Citations

Dose indicator for CyberKnife image‐guided radiation therapy

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

Comparison of CBCT conversion methods for dose calculation in the head and neck region

Irmak

Georg

Lechner

2020

Zeitschrift für Medizinische Physik

View full text Add to dashboard Cite

Tables for effective dose assessment from diagnostic radiology (period 1946–1995) in epidemiologic studies

et al. 2021

View full text Add to dashboard Cite

Diagnostic radiology is a leading cause of man-made radiation exposure to the population. It is an important factor in many epidemiological studies as variable of interest or as potential confounder. The effective dose as a risk related quantity is the most often stated patient dose. Nevertheless, there exists no comprehensive quantification model for retrospective analysis for this quantity. This paper gives a catalog of effective dose values for common and rare examinations and demonstrates how to modify the dose values to adapt them to different calendar years using a quantification concept already used for retrospective analysis of the red bone marrow dose. It covers the time period of 1946 to 1995 and allows considering technical development and different practical standards over time. For an individual dose assessment, if the dose area product is known, factors are given for most examinations to convert the dose area product into the effective dose. Additionally factors are stated for converting the effective dose into the red bone marrow dose or vice versa.

show abstract

Determination of the effective dose delivered by image guided radiotherapy in head & neck and breast treatments

Cited by 5 publications

References 17 publications

Dose indicator for CyberKnife image‐guided radiation therapy

Dose indicator for CyberKnife image‐guided radiation therapy

Comparison of CBCT conversion methods for dose calculation in the head and neck region

Tables for effective dose assessment from diagnostic radiology (period 1946–1995) in epidemiologic studies

Contact Info

Product

Resources

About