Compare of Interfractional Setup Reproducibility Between Vacuum-Lock Bag and Thermoplastic Mask in Radiotherapy for Breast Cancer

Song, Yu; Jin, Peng; Chen, Qianfeng; Luo, Hui

doi:10.1177/15330338211043037

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…In addition, the use of the prone belly board could decrease intraabdominal pressure made possible by the space afforded. The thermoplastic mesh has a higher fit with the body surface to restrict movement compared with the vacuum cushion (17,18). Boxplot of correction error for translation direction in supine position (A) and prone position (B) and correction error for angle rotation in supine position (C) and prone position (D) and bar chart of correction errors between supine and prone position (E).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the use of the prone belly board could decrease intra-abdominal pressure made possible by the space afforded. The thermoplastic mesh has a higher fit with the body surface to restrict movement compared with the vacuum cushion ( 17 , 18 ). Therefore, the prone belly board combined with thermoplastic mesh might decrease the respiratory-induced motion in the prone position.…”

Section: Discussionmentioning

confidence: 99%

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Comparison between supine and prone patient setup for lumbosacral spinal stereotactic body radiosurgery with CyberKnife

Kong

cheng

et al. 2023

Front. Oncol.

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ObjectiveThe aim of this study is to analyze which tracking modality is more suitable for stereotactic body radiosurgery of lumbosacral spinal tumors by comparing prone and supine patient treatment setup.MethodsEighteen patients with lumbosacral spinal tumors were selected. CT simulation was performed in the supine position (fixed with a vacuum cushion) and prone position (fixed with a thermoplastic mask and prone plate), respectively. The plans in the supine and prone positions were designed using the xsight spine tracking (XST) and xsight spine prone tracking (XSPT) modalities, respectively. The dose-volume histogram (DVH) parameters, namely, V100%, D95%, Dmean, conformity index (CI), and heterogeneity index (HI) in planning target volume (PTV), as well as Dmax, D0.1cc, D1cc, and D5cc in the cauda equina and bowel were recorded. The supine plans were simulation plans and were not used for treatment, which were only used to record the alignment errors. The spinal tracking correction errors (alignment error) and correlation errors of the synchrony respiratory model in the prone position were recorded during the treatment. After treatment, the simulation plan of the supine position was implemented and the spinal tracking correction errors were recorded. The parameters of correction error and DVH parameters for the two positions were analyzed using the paired t-test to compare the difference in positioning accuracy and dose distribution. In addition, the correlation errors of the synchrony respiratory model in the prone position were analyzed to evaluate the prediction accuracy of the synchrony model.ResultsFor patient setup, the correction error of the supine position in interior/posterior was (0.18 ± 0.16) mm and the prone position was (0.31 ± 0.26) mm (P< 0.05). The correction error of the supine position in inferior/superior was (0.27 ± 0.24) mm, and the prone position was (0.5 ± 0.4) mm (P< 0.05). The average correlation errors of the synchrony model for left/right, inferior/superior, and anterior/posterior in the prone position were (0.21 ± 0.11) mm, (0.41 ± 0.38) mm, and (0.68 ± 0.42) mm, respectively. For the dose distribution, compared with prone plans, the average CI in supine plans was increased by 4.5% (P< 0.05). There was no significant difference in HI, PTV V100%, D95%, and Dmean between the prone and supine plans. Compared with supine plans, average D1cc and D5cc for the cauda equina was significantly decreased by 4.7 and 15.3% in the prone plan (P< 0.05). For the bowel, average Dmax, D0.1cc, D1cc, and D5cc were reduced by 8.0, 7.7, 5.2, and 26.6% in prone plans (P< 0.05) compared with supine plans.ConclusionCompared with the supine setup, the prone setup combined with XSPT modality for the lumbosacral spinal stereotactic body radiosurgery can spare the bowel and cauda equina of the middle and low dose irradiation, and decrease the number of beams and monitor units.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Comparison between supine and prone patient setup for lumbosacral spinal stereotactic body radiosurgery with CyberKnife

Kong

cheng

et al. 2023

Front. Oncol.

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Improved outcome and reduced toxicities of postmastectomy radiotherapy with integral cervicothoracic thermoplastic mask

Zhang,

Wu,

et al. 2023

Preprint

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Background Appropriate immobilization setup for postmastectomy radiotherapy is critical to improve tumor control and to reduce radiation-related toxicities. This study aims at retrospectively evaluate the outcome and toxicities of postmastectomy radiotherapy (PMRT) with a novel integral cervicothoracic thermoplastic mask strategy. Materials and methods Breast cancer patients were treated with modified radical mastectomy and PMRT. Patient immobilization setup was performed with the placement of a 1-cm thickened wax film on the ipsilateral chest wall and an integral cervicothoracic thermoplastic mask. PMRT was delivered according to the institutional protocol. Dose distribution, disease control, patient survival and radiation-induced toxicities were evaluated. Results 420 eligible patients with complete follow-up information were included in the final analysis. The median follow-up was 40.2 (95%CI: 38.9–41.6) months. Two (0.5%) patients had local recurrence and 48 (11.4%) patients had distant metastasis. There were 23 (5.3%) deaths from all causes, of which 19 were caused by breast cancer. The 3-year overall survival (OS) rate was 94.8%. ER status, PR status, triple negative status, and T stages significantly impacted on patient survival (p < 0.05). HER2 expression, N stage did not significantly affect patient survival. Most common radiation-induced toxicities included grade I (87.6%) and grade II (10.2%) dermatitis, and grade I pneumonitis (28.8%) found by chest X-ray or CT scans. No clinical detectable cardiovascular event related to radiotherapy was identified. Conclusion Postmastectomy radiotherapy with integral cervicothoracic thermoplastic mask resulted in improved outcome and reduced toxicities and might be of clinical significance in breast cancer patient.

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Compare of Interfractional Setup Reproducibility Between Vacuum-Lock Bag and Thermoplastic Mask in Radiotherapy for Breast Cancer

Cited by 2 publications

References 32 publications

Comparison between supine and prone patient setup for lumbosacral spinal stereotactic body radiosurgery with CyberKnife

Comparison between supine and prone patient setup for lumbosacral spinal stereotactic body radiosurgery with CyberKnife

Improved outcome and reduced toxicities of postmastectomy radiotherapy with integral cervicothoracic thermoplastic mask

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