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Study of the TOFPET2c ASIC in time-of-flight detection of x-rays for scatter rejection in medical imaging applications.
Phys Med Biol
January 2025
Physics of Molecular Imaging Systems, RWTH Aachen University, Forckenbeckstraße 55, Aachen, NRW, 52074, GERMANY.
Integrating time-of-flight (ToF) measurements in radiography and computed tomography (CT) enables an approach for scatter rejection in imaging systems that eliminates the need for anti-scatter grids, potentially increasing system sensitivity and image quality. However, present hardware dedicated to the time-correlated measurement of X-rays is limited to a small scale and low density. A switch to highly integrated electronics and detectors is needed to progress towards a medium-scale system capable of acquiring images, while offering a timing resolution below 300 ps FWHM to achieve scatter rejection comparable to current grids.
View Article and Find Full Text PDFThe effect of anti-scatter grids on radiation exposure during transcatheter patent ductus arteriosus closure in premature infants.
Cardiol Young
December 2024
Division of Pediatric Cardiology, University of Iowa Stead Family Children's Hospital, Iowa City, IA, USA.
Background: Radiation exposure and the effect of anti-scatter grids are not well studied in premature infants during transcatheter patent ductus arteriosus closure.This study aimed to investigate whether the use of anti-scatter grids altered the level of radiation exposure to premature infants undergoing transcatheter patent ductus arteriosus closure.
Methods And Results: Demographic and radiation exposure data for premature infants who underwent transcatheter patent ductus arteriosus closure at the Stead Family Children's Hospital from 10/2019 to 10/2021 were retrospectively reviewed and analyzed.
A new method to assess the performance of anti-scatter grids in x-ray projection imaging.
Biomed Phys Eng Express
December 2024
Institute of Radiation Physics (IRA), Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Rue du Grand-Pré 1, 1007 Lausanne, Switzerland.
This work proposes a new method to assess the performance of radiographic anti-scatter grids (ASGs) without the use of a narrow primary beam, which is difficult to achieve.Three general purpose ASGs were evaluated, two marketed ASGs and a low frequency and high ratio prototype ASG with molybdenum lamellae. A range of high scatter x-ray beams were used in a standardized geometry, with energies ranging from 60 kV to 121 kV, for five beam sizes between 10 × 10 and 30 × 30 cm.
View Article and Find Full Text PDFRadiation Reduction in Paediatric Cardiac Catheterization: We Can Go Even Lower.
CJC Pediatr Congenit Heart Dis
August 2024
Safra Children's Hospital, Sheba Medical Center, and the Tel Aviv University, Tel Hashomer, Israel.
Background: Radiation reduction is an integral component in the management of a paediatric cardiac catheterization laboratory. Simple and easily implementable protocol changes and technical upgrades have been shown to significantly reduce radiation exposure.
Methods: Radiation exposures (2020-2022) at Safra Children's Hospital, Sheba Medical Center, Israel (unit A: n = 672) were retrospectively reviewed, including dose area product (DAP) (μGy m), DAP/kg, Air Kerma (mGy), and fluoroscopy time (minutes) for 16 procedural types.
Scatter estimation and correction using time-of-flight and deconvolution in x-ray medical imaging.
Phys Med Biol
August 2024
Département de génie électrique et génie informatique, Université de Sherbrooke, Sherbrooke, Québec, Canada.
Article Synopsis
- * An innovative scatter correction method uses iterative deconvolution to estimate scattered photons in each pixel, significantly improving results over traditional techniques, especially in complex imaging scenarios.
- * Simulation studies indicate that this deconvolution method can recover up to 89% of contrast lost due to scattered photons, and its requirements for source and detector technology are becoming feasible for advanced imaging systems.
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