Three-dimensional imaging with large-area positron cameras

Conference · Wed Jun 01 00:00:00 EDT 1977

OSTI ID:7316505

Perez-Mendez, V; Chang, L T; Lenahan, J P; Macdonald, B

Cameras for nuclear medicine imaging which use the two back-to-back gamma rays from a positron annihilation have the unique property of being able to give images of positron-emitting radionuclide distributions without the use of collimators and the associated large loss of intensity. Cameras with two parallel opposing planar gamma-ray detectors are now commonly used without camera movement to give tomographic images of a number of transverse planes through the positron emitting object. Each of these tomographic images, the set of intersections of the decay-gamma event lines with that plane, has source points in that plane in focus but superimposed on a large background from the blurred-out images from the other planes. We present here a method of three dimensional image reconstruction of these positron images which uses a single exposure to remove the blurred off-plane activity from all tomographic planes simultaneously. The tomographic image on a plane is the sum of contributions from all source planes, each contribution being the convolution of the source distribution on a plane with the camera system point response function for that plane. Fourier transformation of the set of tomographic image equations gives a set of linear equations whose solution, after inverse Fourier transformation, is the desired source reconstruction.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7316505
• Report Number(s): LBL-5501; CONF-760969-2
• Country of Publication: United States
• Language: English

Related Subjects

440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
CAMERAS
COUNTING TECHNIQUES
DIAGNOSTIC TECHNIQUES
FOURIER ANALYSIS
GAMMA CAMERAS
GEOMETRY
IMAGES
MATHEMATICS
MEDICINE
NUCLEAR MEDICINE
PATIENTS
PERFORMANCE TESTING
POSITRON CAMERAS
RADIOISOTOPE SCANNING
TESTING
TOMOGRAPHY