Publications by authors named "A Masaoka"
Article Synopsis
- The study assessed the accuracy of different segmentation methods in adaptive radiotherapy for head-and-neck cancer, specifically focusing on atlas-based auto-segmentation (ABAS), deformable image registration (DIR), and deep learning auto-segmentation (DLAS).
- Seventeen patients were examined, using various datasets for the segmentation methods, including an atlas of 30 patients for ABAS and a training set of 143 for DLAS.
- Results showed that DIR provided the highest accuracy in delineating organs at risk, while mABAS slightly outperformed standard ABAS; no significant accuracy differences were found between ABAS and DLAS, indicating DIR as the best method overall.
Article Synopsis
- The study focused on improving the efficiency of outlining organs at risk (OARs) during intensity-modulated radiation therapy by automating the contouring process using atlas-based auto-segmentation (ABAS).
- Results showed that automation reduced the average time for contour delineation from 57 minutes to 29 minutes, while some OARs still need further geometric accuracy improvements.
- Overall, the ABAS model successfully minimized both work time and software operations, indicating potential for even greater efficiency with enhancements to contour accuracy.
To understand the neural mechanisms of perceptual filling-in at the blind spot (BS), we analyzed neural activity in the region representing the visual field corresponding to the BS (BS region) in the primary visual cortex (V1) of the macaque monkey. We inserted a linear array electrode into the BS region or surrounding region and recorded the multiunit activities (MUAs) and local field potential (LFP). We examined the responses of MUAs and LFP to a large visual stimulus that entirely covered the BS (surface stimuli) while the monkey performed a visual fixation task in either the monocular condition without receiving direct retinal input or the binocular condition receiving retinal information.
View Article and Find Full Text PDF[Improved Patients' Satisfaction Level of Radiation Therapy: The Effect of "Explainer Videos about Radiation Therapy", "Treatment of Breast Cancer Patients by Female Radiation Therapists" and "Treating Male Patients While Wearing Underwear in Pelvic Radiation Therapy"].
Nihon Hoshasen Gijutsu Gakkai Zasshi
March 2023
Purpose: The questionnaire survey investigated whether "Explainer videos about radiation therapy (RT-Video)", "Treatment of breast cancer patients by female radiation therapists (F-RTT)" and "Treating male patients while wearing underwear in pelvic radiation therapy (M-RTT)" can improve patient's satisfaction.
Methods: The RT-Video survey included questions regarding the impression of radiation therapy, improving its understanding, and anxiety reduction (102 patients received radiation therapy). Fifty-one breast cancer patients were asked whether they preferred an F-RTT treatment.
Article Synopsis
- The study assessed the effectiveness of an immobilization system using a shell and wooden baseplate (SW) for lung stereotactic body radiotherapy (SBRT) by comparing setup errors and dose absorption to those from a BodyFix system (BF).
- In 109 patients, setup errors were measured, showing that both SW and BF achieved high accuracy, with over 90% success in keeping errors within 3 mm for interfractional and intrafractional shifts.
- The results indicated that the wooden baseplate had lower dose attenuation and a lesser impact on dose distribution compared to the carbon baseplate, making it a viable option for effective SBRT.