According to recent statistics by American Heart Association that coronary artery disease (CAD) causes approximately 42% of all deaths each year. Currently available myocardial perfusion SPECT is perhaps the most cost-effective means to diagnose the disease. However, its lack of quantitative capability compromises the evaluation of myocardial viability and, therefore, the assessment of myocardial function. The long-term objective of this project is to achieve quantitative myocardial perfusion SPECT by (I) developing efficient reconstruction methods for accurate mapping of radiopharmaceutical distribution inside the myocardium with an improved detector configuration and (II) investigating automatic segmentation techniques for accurate quantification of reconstructed regions-of-interest (ROIs).
The specific aims of this renewal are: (1) To investigate an improved detection configuration: A variable focal-length fan-beam collimated dual-head vertex SPECT system with scanning line sources will improve detection efficiency and spatial resolution and achieve optimal sampling without truncation in both transmission and emission scans. (2) To develop efficient reconstruction and segmentation strategies for the improved detection configuration: Accurate reconstruction and simultaneous compensation for object-specific photon attenuation, scatter and spatially-variant detector response, as well as effective suppresses of noise propagation will be accomplished. Automatic segmentation for quantitative ROI analysis will be achieved. (3) To evaluate the accuracy of reconstruction and segmentation by phantom experiment and patient diagnosis: Criteria of bias-variance graph and miss-segment ratio will be used to quantify the reconstructed images and segmented ROIs against their simulated and experimental anthropomorphic phantoms of the thorax. The performance of variable focal-length fan-beam collimator will be compared to the currently used parallel-hole collimator by means of both receiver operating characteristic curve (human observer) and Hotelling trace criterion (computer observer). Diagnosis of CAD, as well as pulmonary embolism and breast cancer will be assessed

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL051466-05
Application #
6183418
Study Section
Special Emphasis Panel (ZRG1-DMG (02))
Project Start
1996-02-01
Project End
2002-07-31
Budget Start
2000-08-01
Budget End
2001-07-31
Support Year
5
Fiscal Year
2000
Total Cost
$241,336
Indirect Cost
Name
State University New York Stony Brook
Department
Radiation-Diagnostic/Oncology
Type
Schools of Medicine
DUNS #
804878247
City
Stony Brook
State
NY
Country
United States
Zip Code
11794
You, Jiangsheng; Zeng, Gengsheng L; Liang, Zhengrong (2005) FBP Algorithms for Attenuated Fan-Beam Projections. Inverse Probl 21:1801
Li, Xiang; Li, Lihong; Lu, Hongbing et al. (2005) Partial volume segmentation of brain magnetic resonance images based on maximum a posteriori probability. Med Phys 32:2337-45
Schulte, Reinhard W; Bashkirov, Vladimir; Klock, Margio C Loss et al. (2005) Density resolution of proton computed tomography. Med Phys 32:1035-46
Wang, Zigang; Han, Guoping; Li, Tianfang et al. (2005) Speedup OS-EM Image Reconstruction by PC Graphics Card Technologies for Quantitative SPECT with Varying Focal-Length Fan-Beam Collimation. IEEE Trans Nucl Sci 52:1274-1280
Li, Tianfang; You, Jiangsheng; Wen, Junhai et al. (2005) An efficient reconstruction method for nonuniform attenuation compensation in nonparallel beam geometries based on Novikov's explicit inversion formula. IEEE Trans Med Imaging 24:1357-68
You, J; Liang, Z; Zeng, G L (1999) A unified reconstruction framework for both parallel-beam and variable focal-length fan-beam collimators by a Cormack-type inversion of exponential radon transform. IEEE Trans Med Imaging 18:59-65
Liang, Z; Ye, J; Cheng, J et al. (1998) Quantitative cardiac SPECT in three dimensions: validation by experimental phantom studies. Phys Med Biol 43:905-20
You, J; Liang, Z; Bao, S (1998) A harmonic decomposition reconstruction algorithm for spatially varying focal length collimators. IEEE Trans Med Imaging 17:995-1002
You, J; Bao, S; Liang, Z (1997) Benefits of angular expression to reconstruction algorithms for collimators with spatially varying focal lengths. IEEE Trans Med Imaging 16:527-31
Liang, Z; Cheng, J; Ye, J (1997) Validation of the central-ray approximation for attenuated depth-dependent convolution in quantitative SPECT reconstruction. Phys Med Biol 42:433-9