Abstract
The capabilities of a coded aperture imager are significantly enhanced when a detector with excellent energy resolution is used. We are constructing such an imager with a 1.1cm thick, crossed-strip, planar detector which has 38 strips of 2mm pitch in each dimension followed by a large coaxial detector. Full value from this system is obtained only when the images are "fully deconvolved" meaning that the energy spectrum is available from each pixel in the image. The large number of energy bins associated with the spectral resolution of the detector, and the fixed pixel size, present significant computational challenges in generating an image in a timely manner at the conclusion of a data acquisition. The long computation times currently preclude the generation of intermediate images during the acquisition itself. We have solved this problem by building the images on-line as each event comes in using pre-imaged arrays of the system response. The generation of these arrays and the use of fractional mask-to-detector pixel sampling is discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 420-424 |
| Number of pages | 5 |
| Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
| Volume | 505 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Jun 1 2003 |
| Externally published | Yes |
| Event | Proceedings of the tenth Symposium on Radiation - Ann Arbor, MI, United States Duration: May 21 2002 → May 23 2002 |
Keywords
- Coded aperture
- Gamma-ray imaging
- Germanium detector
- Orthogonal strip
- Position sensing
- Strip detector