<scp>AAPM</scp>‐<scp>RSS</scp> Medical Physics Practice Guideline 9.a. for <scp>SRS</scp>‐<scp>SBRT</scp>

Halvorsen, Per H.; Cirino, Eileen T.; Das, Indra J.; Garrett, Jeffrey A.; Yang, Jun; Yin, Fang‐Fang; Fairobent, Lynne

doi:10.1002/acm2.12146

Cited by 118 publications

(75 citation statements)

References 28 publications

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“…Equipment MME v1.5 was commissioned on an Elekta VersaHD linac with two high-dose-rate flattening filter-free (FFF) and two flattened photon modes. The models were validated, and a comprehensive quality assurance process was established according to the recommendations of the American Association of Physicists in Medicine Practice Guidelines 5.a, 8.a, and 9.a [11][12][13].…”

Section: Methodsmentioning

confidence: 99%

Effects of Multileaf Collimator Design and Function When Using an Optimized Dynamic Conformal Arc Approach for Stereotactic Radiosurgery Treatment of Multiple Brain Metastases With a Single Isocenter: A Planning Study

Taylor¹,

Williams²,

Gleason

2020

Cureus

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Background Stereotactic radiosurgery (SRS) or fractionated SRS (fSRS) are effective options for the treatment of brain metastases. When treating multiple metastases with a linear acceleratorbased approach, a single isocenter allows for efficient treatment delivery. In this study, we present our findings comparing dosimetric parameters of Brainlab (Munich, Germany) Elements™ Multiple Brain Mets SRS (MME) software (version 1.5 versus version 2.0) for a variety of scenarios and patients. The impact of multileaf collimator design and function on plan quality within the software was also evaluated. Materials and methods Twenty previously treated patients with a total of 58 lesions (from one to seven lesions each) were replanned with an updated version of the multiple brain Mets software solution. For each plan, the mean conformity index (CI), mean gradient index (GI), the volume of normal brain receiving 12 Gy (V 12), and mean brain dose were evaluated. Additionally, all v2.0 plans were further evaluated with jaw tracking for by Elekta (Stockholm, Sweden) and HD120™ multileaf collimator by Varian Medical Systems (Palo Alto, USA). Results The new software version demonstrated improvements for CI, GI and V 12 (p <0.01). For the Elekta Agility™ multileaf collimator, jaw tracking improved all dosimetric parameters except for CI (p =0.178) and mean brain dose (p =0.93). For the Varian with HD120 multileaf collimator, all parameters improved.

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Section: Methodsmentioning

confidence: 99%

Effects of Multileaf Collimator Design and Function When Using an Optimized Dynamic Conformal Arc Approach for Stereotactic Radiosurgery Treatment of Multiple Brain Metastases With a Single Isocenter: A Planning Study

Taylor¹,

Williams²,

Gleason

2020

Cureus

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“…In general, the effective radiation dose in a year in patients with VUR at our institution was approximately 5.5 mSv/year with the additional natural background radiation sources, including radon, cosmic rays, terrestrial, and internal sources, that results in an effective dose of approximately 620 millirems (6.2 mSv) according to the American Association of Physicists in Medicine (AAPM). 13…”

Section: Discussionmentioning

confidence: 99%

Ionizing Radiation Exposure in Children with Vesicoureteral Reflux: Should We Be Alarmed?

Fernández

Villarraga

Chavarriaga

et al. 2022

Revista Urología Colombiana / Colombian Urology Journal

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Objectives Ionizing radiation imaging is commonly used for diagnosis and follow up in children with vesicoureteral reflux (VUR). We aim to measure the effective dose (mSv) in patients with VUR. Methods We reviewed our electronic database of patients under 8-years-old with VUR. Primary endpoint was to calculate the effective radiation dose (ED). Absolute frequencies and percentages were reported for global qualitative variables. This study conducted a logistic regression model to calculate the odds ratio for radiation exposure. Analysis was performed using STATA version 14.0 (StataCorp LLC, College Station, TX, EEUU). Results A total of 140 patients were found, 97 were assessed for eligibility. We included 59 patients in the final analysis. Mean age was 20 ± 17.9 months, 66% were females. Most cases of VUR were bilateral (44%) and high grade (93.4%). The lowest number of studies per patient was two, with a minimum radiation of 5.7 mSv. The highest radiation was estimated at 20.7 mSv corresponding to a total of five studies. Logistic regression showed that highest grades of VUR and age of first UTI episode were associated with higher ED (OR, 1.7; 95% CI, 0.87-3.31), (OR 1.02; 95% CI 0.97-1.07) respectively. A mean ED for children with VUR was estimated of 5.5 ± 3 mSv/year. Conclusion In our study, the children with VUR were exposed to 5.5 mSv/year without counting the natural background radiation, which is alarming, and we believe should raise awareness worldwide in how we are unnecessarily diagnosing indolent VUR cases and following patients.

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“…In the present study, we observed that the beam-positioning error was within 0.92 mm with a couch angle of 0.5 • at a range of 0 to 5.0 cm distance from the isocenter and confirmed that the accuracy was within 1.0 mm as recommended by the AAPM-RSS. 14 Based on various perspectives regarding the effect of rotational errors on dose distribution for the target and beam-positioning accuracy, rotational errors should be detected and corrected using an imageguided radiotherapy technique. Tsuruta et al evaluated the correlation between intrafractional residual setup errors and the accumulation of delivered dose distributions in 72 consecutive patients with multiple brain metastases.…”

Section: Discussionmentioning

confidence: 99%

“…Focusing on beam-positioning accuracy, the AAPM and Radiosurgery Society (RSS) recommend that the accuracy should be within 1.0 mm for SRS and stereotactic body radiation therapy (SBRT). 14 The beam-positioning accuracy is typically evaluated at the isocenter position; however, it is also necessary to confirm the beam-positioning accuracy at off -isocenter positions. 12,15 To evaluate the beam-positioning accuracy at off -isocenter positions, Gao et al performed an off -isocenter Winston-Lutz (WL) test for SRS and SBRT.…”

Section: Introductionmentioning

confidence: 99%

Automatic measurement of beam‐positioning accuracy at off‐isocenter positions

Ono

Kido

Nakamura

et al. 2022

J Applied Clin Med Phys

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Purpose This study performed an automatic measurement of the off‐axis beam‐positioning accuracy at a single isocenter via the TrueBeam Developer mode and evaluated the beam‐positioning accuracy considering the effect of couch rotational errors. Methods TrueBeam STx and the Winston–Lutz test‐dedicated phantom, with a 3 mm diameter steel ball, were used in this study. The phantom was placed on the treatment couch, and the Winston–Lutz test was performed at the isocenter for four gantry angles (0°, 90°, 180°, and 270°) using an electronic portal imaging device. The phantom offset positions were at distances of 0, 25, 50, 75, and 100 mm from the isocenter along the superior–inferior, anterior–posterior, and left–right directions. Seventeen patterns of multileaf collimator‐shaped square fields of 10 × 10 mm2 were created at the isocenter and off‐axis positions for each gantry angle. The beam‐positioning accuracy was evaluated with couch rotation along the yaw‐axis (0°, ± 0.5°, and ± 1.0°). Results The mean beam‐positioning errors at the isocenter and off‐isocenter distances (from the isocenter to ±100 mm) were 0.46–0.60, 0.44–0.91, and 0.42–1.11 mm for the couch angles of 0°, ±0.5°, and ±1°, respectively. The beam‐positioning errors increased as the distance from the isocenter and couch rotation increased. Conclusion These findings suggest that the beam‐positioning accuracy at the isocenter and off‐isocenter positions can be evaluated quickly and automatically using the TrueBeam Developer mode. The proposed procedure is expected to contribute to an efficient evaluation of the beam‐positioning accuracy at off‐isocenter positions.

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AAPM‐RSS Medical Physics Practice Guideline 9.a. for SRS‐SBRT

Cited by 118 publications

References 28 publications

Effects of Multileaf Collimator Design and Function When Using an Optimized Dynamic Conformal Arc Approach for Stereotactic Radiosurgery Treatment of Multiple Brain Metastases With a Single Isocenter: A Planning Study

Effects of Multileaf Collimator Design and Function When Using an Optimized Dynamic Conformal Arc Approach for Stereotactic Radiosurgery Treatment of Multiple Brain Metastases With a Single Isocenter: A Planning Study

Ionizing Radiation Exposure in Children with Vesicoureteral Reflux: Should We Be Alarmed?

Automatic measurement of beam‐positioning accuracy at off‐isocenter positions

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