A5054432412- Radiation Dose and Imaging
- Advances in Oncology and Radiotherapy
- Advanced X-ray and CT Imaging
- Advanced Radiotherapy Techniques
- Medical Imaging Techniques and Applications
- Radiology practices and education
- Biomedical and Engineering Education
- Radiation Therapy and Dosimetry
- Radiomics and Machine Learning in Medical Imaging
- Digital Radiography and Breast Imaging
- Cardiac Imaging and Diagnostics
- Radiation Shielding Materials Analysis
- Ultrasound in Clinical Applications
- Radiopharmaceutical Chemistry and Applications
- Radioactivity and Radon Measurements
- Traumatic Ocular and Foreign Body Injuries
- AI in cancer detection
- Global Health and Surgery
- Advanced MRI Techniques and Applications
- Effects of Radiation Exposure
- Biotechnology and Related Fields
- Esophageal and GI Pathology
- Retinal and Optic Conditions
- Endometrial and Cervical Cancer Treatments
- Electrical and Bioimpedance Tomography
Chulalongkorn University
2015-2024
King Chulalongkorn Memorial Hospital
2008-2018
Purpose: To measure radiation doses for computed tomography (CT) of the head, chest, and abdomen compare them with diagnostic reference levels, as part International Atomic Energy Agency Research coordination project. Materials Methods: The local ethics committees all participating institutions approved study protocol. Written informed consent was obtained from patients. All scanners were helical single-section or multi–detector row CT systems. Six hundred thirty-three patients undergoing...
The purpose of this study was to survey image quality and the entrance surface air kerma for patients in radiographic examinations perform comparisons with diagnostic reference levels.In multinational prospective study, patient radiation doses were surveyed 12 countries Africa, Asia, Eastern Europe, covering 45 hospitals. rate unsatisfactory images grade noted, causes poor investigated. adult determined terms on basis X-ray tube output measurements exposure parameters. Comparison dose levels...
The use of positron emission tomography/computed tomography (PET/CT) system has heightened the need for medical diagnosis. However, patient dose is increasing in comparison to whole-body PET/CT dose. aim this study determine effective 35 oncology Thai patients with age range 28–60 y from PET scan using [fluorine-18]-fluoro-2-deoxy-D-glucose and CT scan. Cumulated activity residence time various organs were calculated time–activity curves by S-value based on body mass. Mean organ absorbed...
Accurate quantitation of activity provides the basis for internal dosimetry targeted radionuclide therapies. This study investigated quantitative imaging capabilities at sites with a variety experience and equipment assessed levels errors in Single-Photon Emission Computed Tomography (SPECT) planar imaging. Participants from 9 countries took part comparison which planar, SPECT X ray computed tomography (SPECT-CT) were used to quantify activities four epoxy-filled cylinders containing 133Ba,...
Body composition changes complicate antiretroviral therapy. Improvements in lipoatrophy after a switch nucleoside reverse-transcriptase inhibitors (NRTIs) have been demonstrated. We investigated 60 patients switching from failed NRTIs to ritonavir-boosted indinavir and efavirenz.Body (assessed by dual-energy x-ray absorptiometry scan single-slice computed tomography of the abdomen through level fourth lumbar vertebra [L4] mid-right thigh) fasted metabolics were measured at baseline...
Purpose: To investigate the dosimetric accuracy of sliding window gated IMRT compared with static treatment, using varying dose rates.Materials and methods: This study measured changes in output diode array response changing rate, verified precision motion table, distribution film diodes at two depths rate.During 4DCT (4 Dimensional Computed Tomography), patient's respiratory signals target were recorded imported to XY4D simulation table SUN NUCLEAR Corporation simulate respiration tumour...
Medical physicists are essential members of the radiation oncology team. Given increasing complexity radiotherapy delivery, it is important to ensure adequate training and staffing. The aim present study was update a similar survey from 2008 assess situation medical in large diverse Asia Pacific region.Between March July 2011, on profession practice (ROMPs) region performed. sent senior 22 countries. Replies were received countries that collectively represent more than half world's...
Neurointerventional radiology procedures often require a long time to perform. Patient radiation dose is an important issue due the hazards of ionizing radiation. The objective this study was measure peak skin (PSD) and effective estimate deterministic stochastic effects therapeutic interventional neuroradiologic procedure.
This study investigates whether a novel tungsten-containing rubber shield could be used as substitute shielding material in interventional radiology to reduce the occupational exposure of operators scattered radiation from patient. The is lead-free radiation-shielding that contains much 90% tungsten powder by weight. Air kerma rates solid-plate phantoms, simulating patient, were measured with semiconductor dosimeter at height operator's eye (1,600 mm floor), chest (1,300 mm), waist (1,000...
Background: Detection and classification of microcalcifications in breast tissues is crucial for early cancer diagnosis long-term treatment. Objective: This paper aims to propose a robust model capable detection calcifications digital mammogram images using Deep Convolutional Neural Networks (DCNN). Materials methods: An expert radiologist annotated the 3,265 clinical create comprehensive ground truth dataset comprising 2,500 annotations malignant benign calcifications. was utilized train...
Abstract Background and study aims Endoscopic retrograde cholangiopancreatography (ERCP) is commonly performed in a prone or left lateral decubitus (LLD) position. The ocular lens equivalent doses between the two positions may be different because LLD position tube voltage will automatically increase to maintain image quality, increased distance intensifier X-ray result more scattered radiation. We aimed compare of ERCP personnel positions. Patients methods Fifty-five patients with...
Background/Aim: Spatially fractionated radiotherapy (grid therapy) can control some bulky tumors which is challenging for conventional radiotherapy. This study aimed to investigate whether a novel tungsten contained rubber (TCR) grid collimator be employed in electron therapy. Materials and Methods: The TCR placed on solid water phantom, percentage depth doses (PDDs) lateral dose profiles were measured 9 MeV beam with Gafchromic EBT3 films. At the profile, ratios of areas without shielding...
Automatic tube current modulation (ATCM) is now available on all computed tomography (CT) scanners, but there no standard phantom for testing its operation. For this study, a comprising five elliptical sections of varying diameters in the shape pagoda has been made to represent range sizes patients Thailand and Far East. ATCM performance can be evaluated terms how image noise vary with changes sections. Additional rods different materials similar properties human tissues have inserted allow...
The effects of tube potential selection with a computed tomography (CT) automatic current modulation (ATCM) system on radiation dose and image quality have been investigated Canon CT scanner. use different values voltage for imaging, the appropriate settings ATCM system, were evaluated. custom-made phantom consisted three sections sizes inserts various materials. It was scanned using potentials 80-140 kV settings. CTDIvoland in terms noise, contrast, contrast-to-noise ratio (CNR) air,...