Evaluation of the clinical implementation of a tattoo-free positioning technique in breast cancer radiotherapy using ExacTrac.

Purpose: Conventionally, tattoos and temporary skin marks are used in patient positioning procedures for breast cancer radiotherapy. However, many patients dislike these marks because their daily lives are affected by them. Therefore, we developed a new positioning technique using ExacTrac (BrainLAB AG, Munich, Germany).

Stereotactic body radiation therapy for Japanese patients with localized prostate cancer: 2-year results and predictive factors for acute genitourinary toxicities.

Objective: We aimed to report the 2-year results of stereotactic body radiation therapy for prostate cancer and identify the clinical and dosimetric factors that predict acute genitourinary toxicities.

Methods: We retrospectively reviewed the medical records of patients with non-metastatic prostate cancer treated at Toyota Memorial Hospital between 2017 and 2020. The patients were treated with stereotactic body radiation therapy with a total dose of 36.

Dosimetric impacts of beam-hardening filter removal for the CyberKnife system.

Purpose: Equipment refurbishment was performed to remove the beam-hardening filter (BHF) from the CyberKnife system (CK). This study aimed to confirm the change in the beam characteristics between the conventional CK (present-BHF CK) and CK after the BHF was removed (absent-BHF CK) and evaluate the impact of BHF removal on the beam quality correction factors k.

Methods: The experimental measurements of the beam characteristics of the present- and absent-BHF CKs were compared.

Beam Characterization of 10-MV Photon Beam from Medical Linear Accelerator without Flattening Filter.

Aim: This work investigated the dosimetric properties of a 10-MV photon beam emitted from a medical linear accelerator (linac) with no flattening filter (FF). The aim of this study is to analyze the radiation fluence and energy emitted from the flattening filter free (FFF) linac using Monte Carlo (MC) simulations.

Materials And Methods: The FFF linac was created by removing the FF from a linac in clinical use.

[Detailed analysis of multi-leaf collimator movement during radiation delivery using an in-house-developed program].

Multi-leaf collimators (MLCs) are used to modulate intensity during intensity modulated radiation therapy (IMRT). Evaluation of MLC movement in IMRT is important, since the accuracy of MLC movements affects the dose distribution. This evaluation is conventionally performed using an attached Dynalog File Viewer (DFV).