scholarly journals Questionnaire survey on treatment planning techniques for lung stereotactic body radiotherapy in Japan

2019 ◽  
Vol 61 (1) ◽  
pp. 104-116
Author(s):  
Yoshihiro Ueda ◽  
Toru Takakura ◽  
Seiichi Ota ◽  
Satoshi Kito ◽  
Koji Sasaki ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Questionnaire Survey ◽  
Respiratory Motion ◽  
Medical Physics ◽  
Respiratory Gating ◽  
Dose Calculation ◽  
Conformal Radiotherapy ◽  
Breath Holding ◽  
Planning Techniques ◽  
Motion Management

ABSTRACT This study aimed to obtain details regarding treatment planning techniques for lung stereotactic body radiation therapy (SBRT) employed at each institution in Japan by using a questionnaire survey. An Internet questionnaire survey on SBRT procedures performed in 2016 was conducted by the QA/QC committee of the Japan Society of Medical Physics from April to June 2017. The questionnaire assessed two aspects: the environment for SBRT at each institution and the treatment planning techniques with and without respiratory motion management techniques (RMMT). Of the 309 evaluated responses, 218 institutions had performed SBRT. A total of 186 institutions performed SBRT without RMMT and 139 institutions performed SBRT with RMMT. When respiratory motion was ≥10 mm, 69 institutions applied RMMT. The leading RMMT were breath holding (77 institutions), respiratory gating (49 institutions) and real-time tumor tracking (11 institutions). The most frequently used irradiation technique was 3D conformal radiotherapy, which was used in 145 institutions without RMMT and 119 institutions with RMMT. Computed tomography (CT) images acquired under free breathing were mostly used for dose calculation for patients treated without RMMT. The usage ratio of IMRT/VMAT to SBRT is low in Japan, compared to elsewhere in the world (<20% vs ≥70%). Among the available dose calculation algorithms, superposition convolution was the most frequently used regardless of RMMT; however, 2% of institutions have not yet made heterogeneity corrections. In the prescription setting, about half of the institutions applied point prescriptions. The survey results revealed the most frequently used conditions, which may facilitate standardization of treatment techniques in lung SBRT.

scholarly journals Audio-Visual Biofeedback for Respiratory Motion Management: Comparison of the Reproducibility of Breath-Holding between Visual and Audio Guidance

2018 ◽  
Vol 09 (13) ◽  
pp. 2286-2294
Author(s):  
Naoki Sano ◽  
Masahide Saito ◽  
Hiroshi Onishi ◽  
Kengo Kuriyama ◽  
Takafumi Komiyama ◽  
...  
Keyword(s):  
Respiratory Motion ◽  
Breath Holding ◽  
Motion Management ◽  
Visual Biofeedback

scholarly journals Application of OSL dosimetry and 3D printed phantom for comparison of calculation algorithms for VMAT treatment planning

2019 ◽  
Vol 1 (1) ◽  
pp. 30-39
Author(s):  
Daniel Villani ◽  
Carolina Dos Santos Moreno ◽  
Roberto Kenji Sakuraba ◽  
Letícia Lucente Campos
Keyword(s):  
Quality Control ◽  
Treatment Planning ◽  
Medical Physics ◽  
Dose Calculation ◽  
Treatment Techniques ◽  
Acuros Xb ◽  
Target Volumes ◽  
Calculation Algorithms ◽  
Dose Calculation Algorithms ◽  
3D Printed

The application of new commercial and industrial technologies in the fields of dosimetry and medical physics is of great interest to the scientific community, both to validate existing protocols and to develop new methodologies. The popularization of 3D printing techniques has been analyzed as a great advantage in quality control in complex treatment techniques, such as radiotherapy and the development of patient simulators. Portable dosimetry systems such as Landauer MicroStar OSL system are versatile and their use in quality control is of great importance. The aim of this paper is to compare two of the most used dose calculation algorithms used in Varian Eclipse TPS – AAA and Acuros XB – for treatment planning of multiple brain metastases using a 3D printed anthropomorphic phantom and the OSL InLight system for experimental dosimetry validation. A 3D printed anthropomorphic skull phantom was submitted to a CT scan and planed five target volumes. In order of comparison, two dose calculations were performed in the Varian Eclipse 13.6 TPS with "Alabama technique", using the Varian’s AAA and AXB algorithms, and treatment delivered with 6 MV photon beam of a Varian TrueBeam linear accelerator. Landauer nanoDot dosimeters were positioned inside each of the five target volumes planned and the experimental dosimetric results were compared with the algorithms’ calculated doses. The findings of this work indicate that ACUROS XB calculates more accurate doses compared with AAA, with all the experimental agreements better than 96.0 %, probably because of the heterogeneity corrections. The uncertainty analysis of the InLight system device is enough to sustain the dosimetric uncertainties below 3.0 %, validating the results.  

scholarly journals Dosimetric Evaluation of a Treatment Planning System Using the Aapm Medical Physics Practice Guideline 5.a (MPPG 5.a) Validation Tests

2021 ◽  
Author(s):  
Yousif A Yousif ◽  
Jackson Zifodya
Keyword(s):  
Treatment Planning ◽  
Practice Guideline ◽  
Heterogeneous Media ◽  
Medical Physics ◽  
Dose Calculation ◽  
Pass Rate ◽  
Planning System ◽  
Treatment Planning System ◽  
Mean Deviation ◽  
Validation Tests

Abstract In this work, the AAPM Medical Physics Practice Guideline 5.a (MPPG 5.a) validation tests package was used to evaluate the dosimetric performance of a new version of the Eclipse treatment planning system (TPS) algorithms. A series of tests were developed and comparisons between TPS calculated and corresponding beam data measurements have been performed for basic beam validation, heterogeneity correction and IMRT/VMAT dose validation tests. Measurements were performed using a Varian IX Linear Accelerator with the 6 MV, 6MV FFF and 18 MV photon beams, and 6, 9, 12, 16, 20 MeV electron beams. Results for basic dose validation tests yielded differences within 3% for all point doses and pass rate greater than 95% for all depth profiles using 3%/3mm criteria. For testing the ability of the TPS in accounting for tissue inhomogeneity, corresponding comparisons were performed with the presence of a heterogeneous media to simulate an air inhomogeneity. Results showed a mean deviation between the TPS calculated and measured of 1.9%, reaching a maximum of 2.8% for the AAA algorithm. For IMRT/VMAT validation tests, our local criteria passing rate of 95% was used, but no consensus of the tolerance exists. Our results agree well with the data reported accuracy in previous studies of Eclipse TPS. In summary, the AAPM MPPG 5.a validation tests are a valuable package for evaluating dose calculation accuracy and are very useful for TPS upgrade checks, commissioning tests and routine TPS QA.

Tridimensional dose evaluation of the respiratory motion influence on breast radiotherapy treatments using conformal radiotherapy, forward IMRT, and inverse IMRT planning techniques

2021 ◽  
Vol 81 ◽  
pp. 60-68
Author(s):  
Jéssica Caroline Lizar ◽  
Karina Cristina Volpato ◽  
Fernanda Calixto Brandão ◽  
Flávio da Silva Guimarães ◽  
Gustavo Viani Arruda ◽  
...  
Keyword(s):  
Respiratory Motion ◽  
Conformal Radiotherapy ◽  
Breast Radiotherapy ◽  
Planning Techniques ◽  
Dose Evaluation ◽  
Imrt Planning

scholarly journals Magnetic resonance imaging with gradient sound respiration guide

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0254758
Author(s):  
Naoharu Kobayashi
Keyword(s):  
Respiratory Motion ◽  
Respiratory Gating ◽  
Free Breathing ◽  
Pulmonary Vasculature ◽  
Renal Angiography ◽  
Motion Management ◽  
Ultrashort Echo Time ◽  
Mri Scans ◽  
Liver And Kidney ◽  
Gradient Waveforms

Respiratory motion management is crucial for high-resolution MRI of the heart, lung, liver and kidney. In this article, respiration guide using acoustic sound generated by pulsed gradient waveforms was introduced in the pulmonary ultrashort echo time (UTE) sequence and validated by comparing with retrospective respiratory gating techniques. The validated sound-guided respiration was implemented in non-contrast enhanced renal angiography. In the sound-guided respiration, breathe−in and–out instruction sounds were generated with sinusoidal gradient waveforms with two different frequencies (602 and 321 Hz). Performance of the sound-guided respiration was evaluated by measuring sharpness of the lung-liver interface with a 10–90% rise distance, w10-90, and compared with three respiratory motion managements in a free-breathing UTE scan: without respiratory gating (w/o gating), 0-dimensional k-space navigator (k-point navigator), and image-based self-gating (Img-SG). The sound-guided respiration was implemented in stack-of-stars balanced steady-state free precession with inversion recovery preparation for renal angiography. No subjects reported any discomfort or inconvenience with the sound-guided respiration in pulmonary or renal MRI scans. The lung-liver interface of the UTE images for sound-guided respiration (w10-90 = 6.99 ± 2.90 mm), k-point navigator (8.51 ± 2.71 mm), and Img-SG (7.01 ± 2.06 mm) was significantly sharper than that for w/o gating (17.13 ± 2.91 mm; p < 0.0001 for all of sound-guided respiration, k-point navigator and Img-SG). Sharpness of the lung-liver interface was comparable between sound-guided respiration and Img-SG (p = 0.99), but sound-guided respiration achieved better visualization of pulmonary vasculature. Renal angiography with the sound-guided respiration clearly delineated renal, segmental and interlobar arteries. In conclusion, the gradient sound guided respiration can facilitate a consistent diaphragm position in every breath and achieve performance of respiratory motion management comparable to image-based self-gating.

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