Comparison among four immobilization devices for whole breast irradiation with Helical Tomotherapy

Biston, Marie-Claude; Jarril, Jimmy; Dupuis, P.; Boisbouvier, S.; Gassa, F.; Cervellera, Mathilde; Chabaud, Sylvie; Racadot, S.

doi:10.1016/j.ejmp.2019.12.023

Cited by 6 publications

(6 citation statements)

References 20 publications

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“…24 In the present study, we did not assess patient comfort; however, patient positioning as described is consistent with the literature recommendation regarding setup reproducibility. 20,21 Thermoplastic mask and skin reactions Contrary to other data showing that the use of a mask increased the surface dose and subsequently increased skin reactions, 25 in this study, patients with a mask experienced nearly 2 times less grade 2 to 4 skin reactions. However, stratified analysis demonstrated that this is related to the difference in fractionation regimen and eventually to the total dose prescription.…”

Section: Impact Of Bra Use and Other Immobilization Techniquescontrasting

confidence: 75%

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Comparing Accuracy of Thermoplastic Mask versus Commercial Bra for the Immobilization of Pendulous Breast During Radiation Therapy Treatment: A Retrospective Cohort Study

Mulla

Iskanderani

Weber

et al. 2021

Advances in Radiation Oncology

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Purpose This study aimed to compare thermoplastic mask with bra in terms of setup reproducibility and immobilization of pendulous breasts during radiation therapy (RT). Methods and materials Forty-two female patients with breast cancer treated with either intensity modulated RT or 3-dimensional conformal RT were retrospectively reviewed. Of these, 21 benefited from thermoplastic mask immobilization and 21 used a bra. Setup accuracy was evaluated using consecutive cone beam computed tomography/electronic portal imaging device sessions over the first 3 days before treatment (systematic setting), followed by weekly cone beam computed tomography/electronic portal imaging device (random settings), and compared with the reference image to calculate the corresponding translational shift (setup error) in the 3 planes. Average absolute shift values in both systematic and random settings were compared between the 2 groups. Accuracy was analyzed by comparing the percentage of pooled settings within ±0.05 and ±0.1 cm of the reference image. Results Compared with a bra, use of the mask was associated with a smaller longitudinal shift in systematic settings (difference in mean: 0.27 cm; P = .027; Mann-Whitney U test) and a lesser lateral shift in random setting (difference in mean: 0.19 cm; P = .005; Mann-Whitney U test). In the pooled systematic settings, the mask performed relatively better than the bra in the lateral and longitudinal planes, with no statistical significance. In pooled random settings, mask showed greater accuracy than bra in the lateral plane with 86.0% versus 58.9% accuracy at ±0.5 cm ( P < .001) and 48.8% versus 21.7% accuracy at ±0.1 cm ( P < .001), respectively. There was no significant difference in the incidence of radiodermatitis between the 2 groups. However, a hypofractionation regimen was associated with a lower incidence of radiodermatitis, and the severity of skin reactions was positively correlated with treatment dose (unstandardized regression coefficient: B = .001; correlation coefficient: r = .571; P < .001). Conclusions Masks provide superior reproducibility compared with commercially available bras.

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Section: Impact Of Bra Use and Other Immobilization Techniquescontrasting

confidence: 75%

“…The results showed that mask performance ranked second after the BlueBag system with Arm-Shuttle (Elekta, Sweden), with no statistically significant difference between the 2 techniques in a pairwise comparison. 21…”

Section: Accuracy Of Thermoplastic Mask In the Literaturementioning

confidence: 99%

Comparing Accuracy of Thermoplastic Mask versus Commercial Bra for the Immobilization of Pendulous Breast During Radiation Therapy Treatment: A Retrospective Cohort Study

Mulla

Iskanderani

Weber

et al. 2021

Advances in Radiation Oncology

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show abstract

“…The importance of breast radiotherapy is rising, with the increasing component rate of early-stage breast cancer 17 . The setup errors have always being a vexing problem during radiotherapy [18][19][20][21] . It plays an important role in the delineation and definition of PTV [21][22][23][24] or ITV 25 , and therefore affects radiation effect [25][26][27][28] and toxicity 29,30 of the patients.…”

Section: Discussionmentioning

confidence: 99%

“…But because of the expensive cost and technical challenges, many hospitals, including our hospital, cannot perform this BIS. The major BIS in the irradiation department of this hospital is still the breast bracket, Vacuum-lock bag or thermoplastic mask 19 . Previous studies on the breast cancer radiotherapy fixation devices mainly focused on vacuum bag [9][10][11][12][13] , breast board [7][8][9] , and alpha cradle 14,15 .…”

Section: Discussionmentioning

confidence: 99%

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

Song

Jin

Chen

et al. 2021

Technol Cancer Res Treat

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Background: This study aimed to analyze the difference of setup reproducibility between Vacuum-lock bag and Thermoplastic mask in the radiotherapy for breast cancer. Methods: A total of 100 invasive breast carcinoma patients were collected, among whom 50 patients were immobilized with Vacuum-lock bag (VB group), and the other 50 patients were immobilized with Thermoplastic mask (TM group). Set up reproducibility in different axes and comfort levels between two groups at three treatment progress points during the radiation therapy were collected and analyzed. Results: The linear regression model showed that fixed device was an independent factor of radiotherapy setup error (SE). Further subgroup analysis based on different axes showed that the SE caused by the fixed device was obvious in all directions. The comfort level in the VB group was significantly larger than that in the TM group at the beginning of treatment, reduced as the treatment progress going on, and finally disappeared within three weeks. Conclusions: Thermoplastic mask could significantly reduce positioning errors in the radiotherapy of breast cancer. Although more discomfort was found in the TM group, it could be eliminated as the treatment progresses.

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“…[1][2][3] Therefore, studies have shown that an effective immobilization device can reduce setup errors and lead to better treatment outcomes. [4][5][6][7][8] Six-dimensional (6D) setup errors, including 3 translations (vertical, longitudinal, and lateral) and 3 rotations (roll, yaw, and pitch), can be detected by cone beam computed tomography (CBCT) and corrected by 6D couches. As we all know, most modern linear accelerators (LINACs) have 6D couches available as an option, and all modern proton systems utilize 6D couch corrections.…”

Section: Introductionmentioning

confidence: 99%

In Silico Studies of the Impact of Rotational Errors on Translation Shifts and Dose Distribution in Image-Guided Radiotherapy

Cui

Qiu

et al. 2023

Technol Cancer Res Treat

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Objective: To compare the 6-dimensional errors of different immobilization devices and body regions based on 3-dimensional cone beam computed tomography for image-guided radiotherapy and to further quantitatively evaluate the impact of rotational corrections on translational shifts and dose distribution based on anthropomorphic phantoms. Materials and Methods: Two hundred ninety patients with cone beam computed tomographies from 3835 fractions were retrospectively analyzed for brain, head & neck, chest, abdomen, pelvis, and breast cases. A phantom experiment was conducted to investigate the impact of rotational errors on translational shifts using cone beam computed tomography and the registration system. For the dosimetry study, pitch rotations were simulated by adjusting the breast bracket by ±2.5°. Roll and yaw rotations were simulated by rotating the gantry and couch in the planning system by ±3.0°, respectively. The original plan for the breast region was designed in the computed tomography image space without rotation. With the same planning parameters, the original plan was transplanted into the image space with different rotations for dose recalculation. The effect of these errors on the breast target and organs at risk was assessed by dose-volume histograms. Results: Most of the mean rotational errors in the breast region were >1°. A single uncorrected yaw of 3° caused a change of 2.9 mm in longitudinal translation. A phantom study for the breast region demonstrated that when the pitch rotations were −2.5° and 2.5° and roll and yaw were both 3°, the reductions in the planning target volumes-V50 Gy were 20.07% and 29.58% of the original values, respectively. When the pitch rotation was +2.5°, the left lung V5 Gy and heart Dmean were 7.49% and 165.76 Gy larger, respectively, than the original values. Conclusions: Uncorrected rotations may cause changes in the values and directions of translational shifts. Rotational corrections may improve the patient setup and dose distribution accuracy.

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Comparison among four immobilization devices for whole breast irradiation with Helical Tomotherapy

Cited by 6 publications

References 20 publications

Comparing Accuracy of Thermoplastic Mask versus Commercial Bra for the Immobilization of Pendulous Breast During Radiation Therapy Treatment: A Retrospective Cohort Study

Comparing Accuracy of Thermoplastic Mask versus Commercial Bra for the Immobilization of Pendulous Breast During Radiation Therapy Treatment: A Retrospective Cohort Study

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

In Silico Studies of the Impact of Rotational Errors on Translation Shifts and Dose Distribution in Image-Guided Radiotherapy

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