Publications by authors named "Jin Dong Cho"
Improvement of performance for flexible film dosimeter by incorporating additive agents.
Phys Med Biol
April 2024
To evaluate the reduction in energy dependence and aging effect of the lithium salt of pentacosa-10,-12-diynoic acid (LiPCDA) films with additives including aluminum oxide (AlO), propyl gallate (PG), and disodium ethylenediaminetetracetate (EDTA).. LiPCDA films exhibited energy dependence on kilovoltage (kV) and megavoltage (MV) photon energies and experienced deterioration over time.
View Article and Find Full Text PDFArticle Synopsis
- Patient-specific QA is crucial in radiation therapy, ensuring the safe and accurate delivery of doses to patients, yet traditional 2D dose distributions are not adequate for assessing 3D dose information.
- To address this issue, the study proposes a quasi-3D dosimetry system utilizing radiochromic plastic dosimeters (RPDs) of varying sizes to accurately measure dose distribution and mitigate the volume effect.
- The system was tested on different treatment plans (IMRT, VMAT, SABR) involving multiple patients, with gamma analysis used to compare measured and predicted doses, showing promising results in terms of passing rates for dose distribution accuracy.
Purpose: Contact lens-type ocular in vivo dosimeters (CLODs) were recently developed as the first in vivo dosimeter that can be worn directly on the eye to measure the dose delivered to the lens during radiotherapy. However, it has an inherent uncertainty because of its curved shape. Newton's ring effect inevitably occurs because the spacing between the glass window and the active layer is not constant.
View Article and Find Full Text PDFPurpose: The aims of this study were to develop a flexible film dosimeter applicable to the irregular surface of a patient for in vivo dosimetry and to evaluate the device's dosimetric characteristics.
Methods: A flexible film dosimeter with active layers consisting of radiochromic-sensitive films and flexible silicone materials was constructed. The dose-response, sensitivity, scanning orientation dependence, energy dependence, and dose rate dependence of the flexible film dosimeter were tested.
We investigated the influence of incorporating tartrazine on the dose response characteristics of radiochromic 3D dosimeters based on polyurethane resin. We use three types of polyurethane resins with different Shore hardness values: 30 A, 50 A, and 80 D. PRESAGE dosimeters are fabricated with different chemical components and concentrations.
View Article and Find Full Text PDFPurpose: This study aimed to (a) develop a contact lens-type ocular in vivo dosimeter (CLOD) that can be worn directly on the eye and (b) assess its dosimetric characteristics and biological stability for radiation therapy.
Methods: The molder of a soft contact lens was directly used to create the dosimeter, which included a radiation-sensitive component - an active layer similar to a radiochromic film - to measure the delivered dose. A flatbed scanner with a reflection mode was used to measure the change in optical density due to irradiation.
Dosimetric characteristics of a reusable 3D radiochromic dosimetry material.
PLoS One
September 2017
Purpose: To investigate the dosimetric characteristics of PRESAGEREU dosimeters.
Methods: Commercially available PRESAGEREU dosimeters (size of 10 mm × 10 mm × 45 mm) were divided into two groups, with one of the groups placed at room temperature of 22°C (RT group) and another group placed at low temperature of 10°C (LT group). A total of 3 dosimeters (set of dosimeters) were irradiated at a time, with doses of 1 Gy, 2 Gy, 4 Gy, 8 Gy, 12 Gy, 16 Gy, and 20 Gy, at a nominal dose rate of 400 MU/min at temperature of 22°C.