By Topic

PCA-Based Algorithm for Generation of Crystal Lookup Tables for PET Block Detectors

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Breuer, J. ; Max-Planck-Inst. for Neurological Res., Cologne ; Wienhard, K.

State-of-the-art data-acquisition systems for positron emission tomography (PET) block detectors use anger logic to determine preliminary 2-D coordinates of the detection location within the block. Typically, a crystal lookup table (CLT) is then used to map from this position to the index of the crystal in which the particle was actually absorbed. Depending on the complexity of the detector design, it is difficult to calculate these CLTs automatically without need for visual inspection and manual readjustment. We propose a novel technique to construct the CLT. The assignment problem is formulated as an optimization problem, where the number of free parameters is initially twice the number of crystals in the block. The core idea is to reduce the dimension of the search space by principal component analysis. The technique was tested successfully for three different block detector designs (Siemens ECAT Exact HR, Siemens microPET Focus 220, and a prototype block detector built of pixelated lutetium oxyorthosilicate crystals with avalanche photodiodes attached). Important virtues of the new algorithm are very fast processing and a high tolerance toward missing peaks, fused peaks, and nonlinear distortions. Furthermore, the algorithm calculates a performance control value that can be used to quickly identify problematic blocks.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:56 ,  Issue: 3 )