Energy-Discriminating Gadolinium K-Edge X-ray Computed Tomography System
- 1 February 2010
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 49 (2R), 027001
- https://doi.org/10.1143/jjap.49.027001
Abstract
An energy-discriminating K-edge X-ray computed tomography (CT) system is useful for increasing the contrast resolution of a target region utilizing contrast media and for reducing the absorbed dose for patients. The CT system is of the first-generation type of detector using cadmium telluride (CdTe). CT is performed by repeated translations and rotations of an object. Penetrating X-ray photons from the object are detected by a CdTe detector, and event signals of X-ray photons are produced using charge-sensitive and shaping amplifiers. Both photon energy and energy width are selected out using a multichannel analyzer, and the number of photons is counted by a countercard. To perform energy discrimination, a low-dose-rate X-ray generator for photon counting was developed. Its maximum tube voltage and minimum tube current were 110 kV and 1 µA, respectively. In energy-discriminating CT, the tube voltage and tube current were 100 kV and 20 µA, respectively, and the X-ray intensity was 2.98 µGy/s at a distance of 1.0 m from the source and a tube voltage of 100 kV. The demonstration of enhanced gadolinium K-edge X-ray CT was carried out by selecting photons with energies just beyond the gadolinium K-edge energy of 50.3 keV.This publication has 19 references indexed in Scilit:
- Sharper Image of Breast Cancer Cells and Stroma in Dense Breast Using Thinner Angular Filter under X-Ray Dark-Field ImagingJapanese Journal of Applied Physics, 2006
- Tunable narrow-photon-energy X-ray generator utilizing a tungsten-target tubeRadiation Physics and Chemistry, 2006
- Preliminary study for producing higher harmonic hard X-rays from weakly ionized nickel plasmaRadiation Physics and Chemistry, 2006
- X-ray Spectra from Weakly Ionized Linear Copper PlasmaJapanese Journal of Applied Physics, 2006
- Monochromatic flash x-ray generator utilizing a disk-cathode silver tubeOptical Engineering, 2005
- Demonstration of enhanced ‐edge angiography using a cerium target x‐ray generatorMedical Physics, 2004
- Synchrotron crystallographyTrends in Biochemical Sciences, 2000
- Development of a two-dimensional imaging system for clinical applications of intravenous coronary angiography using intense synchrotron radiation produced by a multipole wigglerJournal of Synchrotron Radiation, 1998
- Small-vessel radiography in situ with monochromatic synchrotron radiation.Radiology, 1996
- Phase–contrast X–ray computed tomography for observing biological soft tissuesNature Medicine, 1996