Dosimetric Comparison Between Jaw Tracking and No Jaw Tracking in Intensity-Modulated Radiation Therapy

Yao, Shengyu; Zhang, Yin; Chen, Tingfeng; Zhao, Guojun; Hu, Ziqiang; Lu, Xiaokai; Liu, Yong

doi:10.1177/1533033819841061

Cited by 7 publications

(9 citation statements)

References 16 publications

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“…The extent of the reduction may be related to the location and volume of the target being irradiated. In addition, our results confirmed that the JA‐IMRT/ JT‐VMAT groups could slightly increase treatment plan MUs which were consistent with the previous study 29 …”

Section: Discussionsupporting

confidence: 92%

“…In addition, our results confirmed that the JA-IMRT/ JT-VMAT groups could slightly increase treatment plan MUs which were consistent with the previous study. 29 There are several limitations in the present study that we should pay attention to. First, the number of patients for the current research were small, since only 10 cases from each category of lung cancer were involved, and all of the baseline characteristics might have a possible adverse influence.…”

Section: F I G U R Ementioning

confidence: 86%

“…In addition, our results confirmed that the JA‐IMRT/ JT‐VMAT groups could slightly increase treatment plan MUs which were consistent with the previous study. 29 …”

Section: Discussionmentioning

confidence: 99%

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Comparison of combinations of irradiation techniques and jaw conditions in intensity‐modulated radiotherapy for lung cancer

Peng

Shi

Zhang

et al. 2021

J Applied Clin Med Phys

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Purpose: To assist in the selection of a suitable combination of an irradiation technique and jaw condition in intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc radiotherapy (VMAT) for lung cancer treatment plans. Materials and methods: Thirty patients with lung cancer who underwent radiotherapy were enrolled retrospectively. They were categorized as having central lung cancer, peripheral lung cancer with mediastinal lymph node metastasis (peripheral E lung cancer), and peripheral lung cancer without mediastinal lymph node metastasis (peripheral N lung cancer). Four treatment plans were designed for each patient: fixed jaw and adaptive jaw IMRT technique (FJ-IMRT and JA-IMRT), and fixed jaw and jaw tracking VMAT technique (FJ-VMAT and JT-VMAT). The dose parameters of the four group plans were compared and analyzed. Results: Compared to FJ-IMRT, JA-IMRT significantly reduced the mean dose (D mean ) and volume percentage of 5 Gy (V 5Gy ) of the total lung in central and peripheral N lung cancer. Similarly, compared to FJ-VMAT, JT-VMAT provided better protection to most organs at risk (OARs), particularly for total lung and heart. In comparison with IMRT, VMAT significantly improved the conformity index (CI) of the planning target volume for the three lung cancer classifications, and it reduced the dose of almost all OARs except V 5Gy and D mean of the total lung. Moreover, the mean monitor units of the VMAT groups were far lower than the IMRT groups. Conclusion: Based on the dosimetric findings and considering clinical data published on lung and heart side effects, we propose recommendations on the preferred treatment technique based on tumor location and pulmonary function. For central lung cancer with normal pulmonary function, we advise JT-VMAT techniques. Conversely, for central lung cancer with poor pulmonary function, we recommend JA-IMRT techniques. We advocate JA-IMRT for peripheral E lung cancer. For peripheral N lung cancer, JT-VMAT techniques are strongly recommended.

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Section: Discussionsupporting

confidence: 92%

Section: F I G U R Ementioning

confidence: 86%

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Comparison of combinations of irradiation techniques and jaw conditions in intensity‐modulated radiotherapy for lung cancer

Peng

Shi

Zhang

et al. 2021

J Applied Clin Med Phys

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“…This arrangement decreases the undesired doses delivered to normal tissue and organs at risk (OARs), compared to the arrangements in the static jaw technique (SJT). [3][4][5][6][7][8][9][10][11][12][13][14][15][16] Several authors have explored the patient protection potential improvements in intensitymodulated radiotherapy (IMRT) with JTT. Schmidthalter et al analysed this issue in three academic and two clinical IMRT cases.…”

Section: Introductionmentioning

confidence: 99%

“…They noticed that the benefits of JTT plans were greater for NPC patients with larger tumour volumes and treatment fields. 12 Raj Mani et al estimated the influence of JTT in head and neck cancer patients compared to the static technique. The dose reductions with JTT in V5, V10, V20, V30 and Dmean ranged from 2 to 5% in IMRT plans and from 1 to 3% in VMAT plans.…”

Section: Introductionmentioning

confidence: 99%

Dosimetrical assessment of jaw tracking technique in volumetric modulated arc therapy for a sample of patients with lateralised targets

Moreno¹,

Almada²,

Andino³

et al. 2023

J Radiother Pract

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Introduction: In modulated radiotherapy treatments with the jaw tracking technique (JTT), the collimator jaws can dynamically follow the multileaf collimator apertures and reduce radiation leakage. This reduction protects normal tissue from unwanted doses. Previous research has highlighted the importance of defining which patients will benefit most from JTT. Besides, some authors have expressed their concerns about possible increases in monitor units (MUs). Treatments of patients with peripheral targets and isocentre located in the patient’s midline are of particular interest. The current work assessed the effect of JTT on these cases. Methods: JTT plans for thirty-two patients were compared to plans with the static jaws technique. The volumes of normal tissue receiving 5 Gy (V5), 10 Gy (V10) and 20 Gy (V20), mean dose (Dmean), target coverage parameters D95, D2% and Paddick’s conformity index (PCI) were compared. MUs were also registered for comparisons. The decrease in the jaws opening with JTT was correlated to the decrease in dose values in normal tissue. Results: Small decreases were observed in D95 and in D2% values, without statistical significance. A 5% average decrease in PCI values was noticed as well as significant decreases in V5, V10 and Dmean values, 9% on average. A 3% decrease in V20 was also observed. The number of MUs decreased by 2%. A significant correlation was found between the reduction of the secondary collimation opening areas and the dose delivered to normal tissue. Conclusions: JTT technique improved normal tissue protection in volumetric modulated arc therapy treatments for the patients included in the present study.

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Research on the correction method for radiotherapy verification plans based on displaced electronic portal imaging device

Guo,

Zhou,

Zeng

2024

J Applied Clin Med Phys

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BackgroundIt has been observed that under the single isocenter conditions, the potential shifts of the electronic portal imaging devices (EPID) may be introduced when executing portal dosimetry (PD) plans for bilateral breast cancer, pleural mesothelioma, and lymphoma. These shifts are relative to the calibration positions of EPID and result in significant discrepancies in the plan verification results.PurposeTo explore methods including correction model and specific correction matrices to revise the data obtained from displaced EPID.MethodsTwo methods, the correction model and the specific correction matrices, were applied to correct the data. Five experiments were designed and conducted to build correction model and to validate the effectiveness of these two methods. Gamma passing rates were calculated and data profiles along X‐axis and Y‐axis were captured.ResultsThe gamma passing rates for the EPID‐displaced IMRT validation plans after applying correction model, along with the application of specific correction matrices to VMAT and IMRT validation plans, exhibit results that are comparable to the cases with non‐displaced EPID. Except for the VMAT plans applied correction model which showed larger discrepancies (0.041 ± 0.028, 0.049 ± 0.030), the other three exhibit minimal differences in discrepancy values. In all profiles, the corrected data from displaced EPID exhibit a high level of agreement with data obtained from non‐displaced EPID. Good consistency is observed in actual application of the correction model and the specific correction matrices between gamma passing rates of data corrected and those of non‐displaced data.ConclusionsThe proposed methods involving correction model and specific correction matrices can correct the data collected from the displaced EPID, and the gamma passing rates of the corrected data show results that are comparable to some extent with those of non‐displaced data. Particularly, the results corrected by specific correction matrices closely resemble the data from non‐displaced EPID.

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Dosimetric Comparison Between Jaw Tracking and No Jaw Tracking in Intensity-Modulated Radiation Therapy

Cited by 7 publications

References 16 publications

Comparison of combinations of irradiation techniques and jaw conditions in intensity‐modulated radiotherapy for lung cancer

Comparison of combinations of irradiation techniques and jaw conditions in intensity‐modulated radiotherapy for lung cancer

Dosimetrical assessment of jaw tracking technique in volumetric modulated arc therapy for a sample of patients with lateralised targets

Research on the correction method for radiotherapy verification plans based on displaced electronic portal imaging device

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