Computed tomography with monochromatic x rays from the national synchrotron light source

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:199550

Dilmanian, F A ^[1]

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1. Brookhaven National Lab., Upton, NY (United States)

A monochromatic computed tomography (CT) system for imaging the human head and neck is being developed at the X17 wiggler beam line of the NSLS. The system, entitled multiple energy computed tomography (MECT), employs a horizontal fan beam and an upright, seated subject rotating about a vertical central body axis. The narrow energy bandwidth of the beam ({approx}0.2% FWHM) eliminates beam-hardening effects and allows the efficient use of the energy-selective methods of K-Edge Subtraction (KES) of iodine and of other high-Z elements, and Dual Photon Absorptiometry (DPA). A prototype of MECT has provided images of phantoms, and of rats and rabbits in vivo. The following components of the clinical MECT have been constructed and are being tested. The monochromator, a Laue-Laue device employing independent gimbal mechanisms, has provided adequate stability and precision. The detector, a 480-element device composed of linear-array modules of CdWO{sub 4} having 32 elements with 0.5 mm center-to-center spacing, coupled to PIN diode modules of corresponding geometry, is currently being tested. The data acquisition system, which employs a fast interface to the host DEC Alpha computer, is also being commissioned. The interface allows sustained data collection at a rate of 1.4 Mbyte/s for several hundred seconds. The first studies with human subjects are expected in 1996, with a 0.5 mm FWHM in-plane resolution and a 20 cm field of view.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 199550
• Report Number(s): CONF-941129--
• Country of Publication: United States
• Language: English

Related Subjects

55 BIOLOGY AND MEDICINE
BASIC STUDIES
BIOMEDICAL RADIOGRAPHY
CAT SCANNING
HEAD
IMAGE PROCESSING
NECK
NSLS
SYNCHROTRON RADIATION