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 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 Plan quality assessment of modern radiotherapy delivery techniques in left-sided breast cancer: an analysis stratified by target delineation guidelines

BJR|Open ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 20200007
Author(s):  
Irfan Ahmad ◽  
Kundan Singh Chufal ◽  
Chandi Prasad Bhatt ◽  
Alexis Andrew Miller ◽  
Ram Bajpai ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Quality Assessment ◽  
Repeated Measures ◽  
Volumetric Modulated Arc Therapy ◽  
Plan Quality ◽  
Breast Radiotherapy ◽  
Planning Techniques ◽  
Target Delineation ◽  
Whole Breast Radiotherapy ◽  
Imrt Planning

Objective: This study compares planning techniques stratified by consensus delineation guidelines in patients undergoing whole-breast radiotherapy based on an objective plan quality assessment scale. Methods: 10 patients with left-sided breast cancer were randomly selected, and target delineation for intact breast was performed using Tangent (RTOG 0413), ESTRO, and RTOG guidelines. Consensus Plan Quality Metric (PQM) scoring was defined and communicated to the physicist before commencing treatment planning. Field-in-field IMRT (FiF), inverse IMRT (IMRT) and volumetric modulated arc therapy (VMAT) plans were created for each delineation. Statistical analyses utilised a two-way repeated measures analysis of variance, after applying a Bonferroni correction. Results: Total PQM score of plans for Tangent and ESTRO were comparable for FiF and IMRT techniques (FiF vs IMRT for Tangent, p = 0.637; FiF vs IMRT for ESTRO, p = 0.304), and were also significantly higher compared to VMAT. Total PQM score of plans for RTOG revealed that IMRT planning achieved a significantly higher score compared to both FiF and VMAT (IMRT vs FiF, p < 0.001; IMRT vs VMAT, p < 0.001). Conclusions: Total PQM scores were equivalent for FiF and IMRT for both Tangent and ESTRO delineations, whereas IMRT was best suited for RTOG delineation. Advances in knowledge: FiF and IMRT planning techniques are best suited for ESTRO or Tangent delineations. IMRT also yields better results with RTOG delineation.

A Comparative Study of 4 VMAT and Standard IMRT Planning Techniques for Ipsilateral Irradiation of the Head and Neck

2011 ◽  
Vol 81 (2) ◽  
pp. S833
Author(s):  
A.L. Damato ◽  
D.J. Sher ◽  
R.I. Berbeco ◽  
J. Brown ◽  
M.A. Czerminska ◽  
...  
Keyword(s):  
Comparative Study ◽  
Head And Neck ◽  
Planning Techniques ◽  
Imrt Planning

Effect of respiratory motion on the delivery of breast radiotherapy using SMLC intensity modulation

2006 ◽  
Vol 34 (1) ◽  
pp. 347-351 ◽  
Author(s):  
Qiang Liu ◽  
Patrick McDermott ◽  
Jay Burmeister
Keyword(s):  
Respiratory Motion ◽  
Intensity Modulation ◽  
Breast Radiotherapy

SU-FF-J-123: The Effect of Respiratory Motion On Two Breast Radiotherapy Techniques: A Phantom Study

2006 ◽  
Vol 33 (6Part6) ◽  
pp. 2048-2049
Author(s):  
G Menon ◽  
D Pudney ◽  
W Smith ◽  
P Dunscombe
Keyword(s):  
Respiratory Motion ◽  
Phantom Study ◽  
Breast Radiotherapy ◽  
Radiotherapy Techniques

scholarly journals Hypofractionation in postmastectomy breast irradiation. How safe are we in using standard tangentials?

2017 ◽  
Vol 03 (02) ◽  
pp. 101-105
Author(s):  
Bindhu Joseph ◽  
Nisma Farooq ◽  
Muhammed N. Shafeeque ◽  
S. Sathiyan ◽  
V. Lokesh ◽  
...  
Keyword(s):  
Conformal Radiotherapy ◽  
Target Volume ◽  
Conformity Index ◽  
High Dose ◽  
Average Dose ◽  
Breast Radiotherapy ◽  
Cardiac Dose ◽  
Radiotherapy Field ◽  
Dose Homogeneity ◽  
Gray Areas

Abstract Aim: Hypofractionation in breast radiotherapy is gaining increasing relevance in routine clinical practice; however, gray areas remain on its safety. Majority of data regarding the same pertains to the treatment of the conserved breast. This study aimed to compare the use of standard wedge-based tangentials (two-dimensional [2D] TW) versus 3D conformal radiotherapy field in the field (3DCRT FIF) with the intent of evaluating if the latter would provide a dosimetric advantage. Materials and Methods: Twenty-six postmastectomy patients were enrolled in this study. Comparative plans using 2D TW and 3DCRT FIF were generated to deliver 50 Gy in 25 fractions. Dosimetric parameters pertaining target dose, Homogeneity Index (HI), Conformity Index, and dose to normal structures were compared and analyzed. The parameters that achieved significance were evaluated using the hypofractionated plan. Results: The 3DCRT FIF plan showed better planning target volume coverage, V95% (P < 0.001) and less cardiac dose (V30 and MD) as well as lung V20, V30, MD, and V5 for both lungs (P < 0.001). The dose to the left descending coronary artery (LAD) was also less with a trend toward significance (P = 0.07). The 3DCRT FIF plan also improved HI (P = 0.02). However, the high-dose volume V107% and radiation exposure were not higher. The significant parameters were evaluated in the hypofractionated schedule of 40 Gy/15 Fr. The MD to the heart was 8.96 Gy in FIF plan versus 20.16 Gy in TW plan. The average V20 to the ipsilateral lung was 37.8% versus 65.2%. The average dose to the contralateral breast was 50% less, i.e., 3.92 Gy versus 8.96 Gy. Conclusion: The results of this study suggest that there would be a significant benefit of using 3DCRT FIF plans for patients being considered for hypofractionated radiotherapy in the postmastectomy setup.

Sign in / Sign up

Export Citation Format

Share Document