A new proposal on use of the dual beam produced by an elliptic-MPW (EMPW) for angiography (abstract)

Journal Article · Wed Jan 01 00:00:00 EST 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1142664· OSTI ID:5520109

Hyodo, K; Shiwaku, H; Yamamoto, S; Kitamura, H; Ando, M ^[1]

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1. Photon Factory, National Laboratory for High Energy Physics, Oho 1-1, Tsukuba, Ibaraki 305 (Japan)

We have been developing a two-dimensional imaging system for {ital K}-edge subtraction angiography with a large size monochromatic SR beam by using asymmetrical reflection from a crystal and a two-dimensional detector system (M. Akisada {ital et} {ital al}., Nucl. Instrum. Methods A {bold 246}, 713 (1987); K. Hyodo {ital et} {ital al}., KEK-Preprint 89--181 (1990)). Through our preliminary experiments, the advantages in the two-dimensional imaging system with real-time image aquisition were confirmed. However, taking account of a clinical application, it needs a faster energy switching system between above and below the {ital K}-edge energy and the incident x-ray intensity onto a patient should be more than 10{sup 11} photons mm{sup 2}/s to attain subtracted images with high S/N ratio. If the dual SR beam produced by an EMPW would be used, we can overcome those problems. The EMPW installed at the accumulation ring (AR) primarily designed to produce elliptically polarized SR also naturally yields dual and very intense linearly polarized SR (S. Yamamoto {ital et} {ital al}., Phys. Rev. Lett. {bold 62}, 2672 (1989)). Their angle separation is described as {Psi}=2{times}{ital K}{sub {ital x}}/{gamma}(rad), where {ital K}{sub {ital x}}=0.834{ital B}{sub {ital xe}}{lambda}{sub {ital u}}, {ital B}{sub {ital xe}} is the value of the horizontal magnetic field, {lambda}{sub {ital u}} is the periodicity of the magnet array, and {gamma} is the ratio of the acceleration energy over the rest energy of an electron. In the case of the current device, its maximum separation is about 0.48 mrad.

• OSTI ID: 5520109
• Journal Information: Review of Scientific Instruments; (United States), Vol. 63:1; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
SYNCHROTRON RADIATION SOURCES
BIOMEDICAL RADIOGRAPHY
BLOOD VESSELS
IMAGE PROCESSING
KEK PHOTON FACTORY
PHOTON BEAMS
USES
X-RAY EQUIPMENT
BEAMS
BODY
CARDIOVASCULAR SYSTEM
DIAGNOSTIC TECHNIQUES
EQUIPMENT
MEDICINE
NUCLEAR MEDICINE
ORGANS
PROCESSING
RADIATION SOURCES
RADIOLOGY
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments