Kinematics of Compton backscattering x-ray source for angiography
Calculations of X-Ray production rates, energy spread, and spectrum of Compton-backscattered photons from a Free Electron Laser on an electron beam in a low energy (136-MeV) compact (8.5-m circumference) storage ring indicate that an X-Ray intensity of 34.6 10{sup 7} X-Ray photons per 0.5-mm {times} 0.5-mm pixel for Coronary Angiography near the 33.169-keV iodine K-absorption edge can be achieved in a 4-msec pulse within a scattering cone of 1-mrad half angle. This intensity, at 10-m from the photon-electron interaction point to the patient is about a factor of 10 larger than presently achieved from a 4.5-T superconducting wiggler source in the NSLS 2.5-GeV storage ring and over an area about 5 times larger. The 2.2-keV energy spread of the Compton-backscattered beam is, however, much larger than the 70-eV spread presently attained form the wiggler source and use of a monochromator. The beam spot at the 10-m interaction point-to-patient distance is 20-mm diameter; larger spots are attainable at larger distances but with a corresponding reduction in X-Ray flux. Such a facility could be an inexpensive clinical alternative to present methods of non-invasive Digital Subtraction Angiography (DSA), small enough to be deployed in an urban medical center, and could have other medical, industrial and aerospace applications. Problems with the Compton backscattering source include laser beam heating of the mirror in the FEL oscillator optical cavity, achieving a large enough X-Ray beam spot at the patient, and obtaining radiation damping of the transverse oscillations and longitudinal emittance dilution of the storage ring electron beam resulting from photon-electron collisions without going to higher electron energy where the X-Ray energy spread becomes excessive for DSA. 38 refs.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5266483
- Report Number(s):
- BNL-47503; ON: DE92014016
- Country of Publication:
- United States
- Language:
- English
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43 PARTICLE ACCELERATORS
BIOMEDICAL RADIOGRAPHY
IODINE
K ABSORPTION
X-RAY SOURCES
KINETICS
BACKSCATTERING
BEAM DYNAMICS
COMPTON EFFECT
ELECTRON BEAMS
FREE ELECTRON LASERS
NSLS
STORAGE RINGS
SYNCHROTRON RADIATION SOURCES
X-RAY SPECTRA
ABSORPTION
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BEAMS
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DIAGNOSTIC TECHNIQUES
ELASTIC SCATTERING
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ELEMENTS
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HALOGENS
INTERACTIONS
LASERS
LEPTON BEAMS
MEDICINE
NONMETALS
NUCLEAR MEDICINE
PARTICLE BEAMS
RADIATION SOURCES
RADIOLOGY
SCATTERING
SPECTRA
SYNCHROTRONS
X-RAY EQUIPMENT
550602* - Medicine- External Radiation in Diagnostics- (1980-)
430000 - Particle Accelerators