Surgical probe design for a coincidence imaging system without a collimator

J. R. Saffer, Harrison H Barrett, H. B. Barber, J. M. Woolfenden

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Surgical probes used in nuclear medicine can be maneuvered close to a suspected tumor site, thereby achieving higher resolution and sensitivity than external gamma cameras. Tomography with handheld probes is not possible, however, so it is difficult to determine whether an increase in the photon count rate is caused by features near the probe or by variations in the distant background radiation. Our group has experimented with several probe designs that address this problem. This paper describes a probe that images nearby objects without a collimator, and which is insensitive to inhomogeneities in the distant background level. The probe, which is used with a radionuclide that emits multiple photons per decay, such as 111 In, consists of a collimatorless array of gamma-ray detectors connected by coincidence circuitry. We used a Monte Carlo routine to simulate data collection from such a system and reconstructed the images using the pseudoinverse obtained by singular value decomposition. The images show a significant suppression of distant sources when compared to a probe equipped with a conventional parallel-hole collimator.

Original languageEnglish (US)
Pages (from-to)333-341
Number of pages9
JournalImage and Vision Computing
Volume10
Issue number6
DOIs
StatePublished - 1992

Fingerprint

Imaging systems
Photons
Nuclear medicine
Singular value decomposition
Radioisotopes
Gamma rays
Tomography
Tumors
Cameras
Detectors
Radiation

Keywords

  • gamma rays
  • Monte Carlo
  • nuclear medicine
  • singular value decomposition (SVD)
  • surgical probes

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Signal Processing
  • Electrical and Electronic Engineering

Cite this

Surgical probe design for a coincidence imaging system without a collimator. / Saffer, J. R.; Barrett, Harrison H; Barber, H. B.; Woolfenden, J. M.

In: Image and Vision Computing, Vol. 10, No. 6, 1992, p. 333-341.

Research output: Contribution to journalArticle

Saffer, J. R. ; Barrett, Harrison H ; Barber, H. B. ; Woolfenden, J. M. / Surgical probe design for a coincidence imaging system without a collimator. In: Image and Vision Computing. 1992 ; Vol. 10, No. 6. pp. 333-341.
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