Skin Dose Comparison of CyberKnife and Helical Tomotherapy for Head-and-Neck Stereotactic Body Radiotherapy

Yoon, Jeongmin; Park, Kwangwoo; Kim, Jin Sung; Kim, Yong Bae; Lee, Ho

doi:10.14316/pmp.2019.30.1.1

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…The most appropriate delivery mode for tomotherapy-based TBI is yet to be determined. The TH mode is a rotational IMRT and provides a 360-degree beam delivery that may result in optimal dose conformity [13][14][15]. The TD mode uses a fixed gantry angle that includes two gantry angles instead of rotational beam delivery, which shortens treatment time and reduces the low dose spread of radiation in organs at risk [15,16].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of hybrid TomoHelical- and TomoDirect-based volumetric gradient matching technique for total body irradiation

Hong

Kim

et al. 2019

Radiat Oncol

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Background: Tomotherapy-based total body irradiation (TBI) is performed using the headfirst position (HFP) and feet-first position (FFP) due to treatment length exceeding the 135 cm limit. To reduce the dosimetric variation at the match lines, we propose and verify a volumetric gradient matching technique (VGMT) by combining TomoHelical (TH) and TomoDirect (TD) modes. Methods: Two planning CT image sets were acquired with HFP and FFP using 15 × 55 × 18 cm 3 of solid water phantom. Planning target volume (PTV) was divided into upper, lower, and gradient volumes. The junction comprised 2-cm thick five and seven gradient volumes (5-GVs and 7-GVs) to create a dose distribution with a gentle slope. TH-IMRT and TD-IMRT plans were generated with 5-GVs and 7-GVs. The setup error in the calculated dose was assessed by shifting dose distribution of the FFP plan by 5, 10, 15, and 20 mm in the longitudinal direction and comparing it with the original. Doses for 95% (D95) and 5% of the PTV (D5) were calculated for all simulated setup error plans. Absolute dose measurements were performed using an ionization chamber in the junction. Results: The TH&TD plan produced a linear gradient in junction volume, comparable to that of the TH&TH plan. D5 of the PTV was 110% of the prescribed dose when the FFP plan was shifted 0.7 cm and 1.2 cm in the superior direction for 5-GVs and 7-GVs. D95 of the PTV decreased to < 90% of the prescribed dose when the FF plan was shifted 1.1 cm and 1.3 cm in the inferior direction for 5-GVs and 7-GVs. The absolute measured dose showed a good correlation with the calculated dose in the gradient junction volume. The average percent difference (±SD) in all measured points was − 0.7 ± 1.6%, and the average dose variations between depths was − 0.18 ± 1.07%. Conclusion: VGMT can create a linear dose gradient across the junction area in both TH&TH and TH&TD and can minimize the dose sensitivity to longitudinal setup errors in tomotherapy-based TBI.

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Section: Introductionmentioning

confidence: 99%

Feasibility of hybrid TomoHelical- and TomoDirect-based volumetric gradient matching technique for total body irradiation

Hong

Kim

et al. 2019

Radiat Oncol

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“…Volumetric imaging, such as cone-beam computed tomography (CBCT) or megavoltage CT, is being rapidly adopted as a common modality in image guided radiation therapy (IGRT) [1][2][3][4] . In particular, CBCT mounted on the gantry of a linear accelerator is scanned to improve the target accuracy and precision by minimizing anatomic deviations prior to the beginning of each fraction 5 .…”

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confidence: 99%

Low-dose CBCT reconstruction via joint non-local total variation denoising and cubic B-spline interpolation

Lee

Park

Choi

et al. 2021

Sci Rep

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This study develops an improved Feldkamp–Davis–Kress (FDK) reconstruction algorithm using non-local total variation (NLTV) denoising and a cubic B-spline interpolation-based backprojector to enhance the image quality of low-dose cone-beam computed tomography (CBCT). The NLTV objective function is minimized on all log-transformed projections using steepest gradient descent optimization with an adaptive control of the step size to augment the difference between a real structure and noise. The proposed algorithm was evaluated using a phantom data set acquired from a low-dose protocol with lower milliampere-seconds (mAs).The combination of NLTV minimization and cubic B-spline interpolation rendered the enhanced reconstruction images with significantly reduced noise compared to conventional FDK and local total variation with anisotropic penalty. The artifacts were remarkably suppressed in the reconstructed images. Quantitative analysis of reconstruction images using low-dose projections acquired from low mAs showed a contrast-to-noise ratio with spatial resolution comparable to images reconstructed using projections acquired from high mAs. The proposed approach produced the lowest RMSE and the highest correlation. These results indicate that the proposed algorithm enables application of the conventional FDK algorithm for low mAs image reconstruction in low-dose CBCT imaging, thereby eliminating the need for more computationally demanding algorithms. The substantial reductions in radiation exposure associated with the low mAs projection acquisition may facilitate wider practical applications of daily online CBCT imaging.

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Dose perturbation by metallic biliary stent in external beam radiotherapy of pancreato-biliary cancers

Lee

Yoon

Park

et al. 2019

Australas Phys Eng Sci Med

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Skin Dose Comparison of CyberKnife and Helical Tomotherapy for Head-and-Neck Stereotactic Body Radiotherapy

Abstract: Take clinical efficiency to new levels through smart, personalized automation.

Cited by 3 publications

References 16 publications

Feasibility of hybrid TomoHelical- and TomoDirect-based volumetric gradient matching technique for total body irradiation

Feasibility of hybrid TomoHelical- and TomoDirect-based volumetric gradient matching technique for total body irradiation

Low-dose CBCT reconstruction via joint non-local total variation denoising and cubic B-spline interpolation

Dose perturbation by metallic biliary stent in external beam radiotherapy of pancreato-biliary cancers

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