An analytical algorithm for skew-slit imaging geometry with nonuniform attenuation correction

2006 ◽  
Vol 33 (4) ◽  
pp. 997-1004 ◽  
Author(s):  
Qiu Huang ◽  
Gengsheng L. Zeng
Keyword(s):  
Attenuation Correction ◽  
Imaging Geometry ◽  
Analytical Algorithm ◽  
Nonuniform Attenuation Correction

10.49 Comparison between the effectiveness of gated SPECT and nonuniform attenuation correction

2001 ◽  
Vol 8 (1) ◽  
pp. S72-S72
Author(s):  
N BALLANI ◽  
H KHAN ◽  
S MOHANNADI ◽  
H SALMAN ◽  
S BOROUSELY ◽  
...  
Keyword(s):  
Attenuation Correction ◽  
Gated Spect ◽  
Nonuniform Attenuation Correction

Nonuniform attenuation correction using simultaneous transmission and emission converging tomography

1992 ◽  
Vol 39 (4) ◽  
pp. 1134-1143 ◽  
Author(s):  
C.-H. Tung ◽  
G.T. Gullberg ◽  
G.L. Zeng ◽  
P.E. Christian ◽  
F.L. Datz ◽  
...  
Keyword(s):  
Attenuation Correction ◽  
Nonuniform Attenuation Correction ◽  
Simultaneous Transmission

Effect of scatter and attenuation correction in ROI analysis of brain perfusion scintigraphy

2007 ◽  
Vol 46 (03) ◽  
pp. 101-106 ◽  
Author(s):  
J. Hashimoto ◽  
K. Ogawa ◽  
A. Kubo ◽  
A. Fukunaga ◽  
S. Onozuka ◽  
...  
Keyword(s):  
Attenuation Correction ◽  
Single Photon ◽  
Scatter Correction ◽  
Photon Emission ◽  
Brain Perfusion ◽  
Projection Data ◽  
Reference Area ◽  
Whole Brain ◽  
Transmission Scan ◽  
Nonuniform Attenuation Correction

SummaryThe aim of this study was to evaluate the effect of scatter and attenuation correction in region of interest (ROI) analysis of brain perfusion single-photon emission tomography (SPECT), and to assess the influence of selecting the reference area on the calculation of lesion-to-reference count ratios. Patients, methods: Data were collected from a brain phantom and ten patients with unilateral internal carotid artery stenosis. A simultaneous emission and transmission scan was performed after injecting 123I-iodoamphetamine. We reconstructed three SPECT images from common projection data: with scatter correction and nonuniform attenuation correction, with scatter correction and uniform attenuation correction, and with uniform attenuation correction applied to data without scatter correction. Regional count ratios were calculated by using four different reference areas (contralateral intact side, ipsilateral cerebellum, whole brain and hemisphere). Results: Scatter correction improved the accuracy of measuring the count ratios in the phantom experiment. It also yielded marked difference in the count ratio in the clinical study when using the cerebellum, whole brain or hemisphere as the reference. Difference between nonuniform and uniform attenuation correction was not significant in the phantom and clinical studies except when the cerebellar reference was used. Calculation of the lesion-to-normal count ratios referring the same site in the contralateral hemisphere was not dependent on the use of scatter correction or transmission scan-based attenuation correction. Conclusion: Scatter correction was indispensable for accurate measurement in most of the ROI analyses. Nonuniform attenuation correction is not necessary when using the reference area other than the cerebellum.

EM-IntraSPECT algorithm with ordered subsets (OSEMIS) for nonuniform attenuation correction in cardiac imaging

2002 ◽  
Author(s):  
Andrzej Krol ◽  
Ifeanyi Echeruo ◽  
Roberto B. Solgado ◽  
Amol S. Hardikar ◽  
James E. Bowsher ◽  
...  
Keyword(s):  
Attenuation Correction ◽  
Cardiac Imaging ◽  
Nonuniform Attenuation Correction

scholarly journals The Role of CT-Based Attenuation Correction and Collimator Blurring Correction in Striatal Spect Quantification

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
J. M. Warwick ◽  
S. Rubow ◽  
M. du Toit ◽  
E. Beetge ◽  
P. Carey ◽  
...  
Keyword(s):  
Attenuation Correction ◽  
Single Photon ◽  
Photon Emission ◽  
Patient Data ◽  
Spect Imaging ◽  
Emission Computed Tomography ◽  
Phantom Data ◽  
Specific Uptake ◽  
Spect Reconstruction ◽  
Nonuniform Attenuation Correction

Purpose. Striatal single photon emission computed tomography (SPECT) imaging of the dopaminergic system is becoming increasingly used for clinical and research studies. The question about the value of nonuniform attenuation correction has become more relevant with the increasing availability of hybrid SPECT-CT scanners. In this study, the value of nonuniform attenuation correction and correction for collimator blurring were determined using both phantom data and patient data. Methods. SPECT imaging was performed using 7 anthropomorphic phantom measurements, and 14 patient studies using [I-123]-FP-CIT (DATSCAN). SPECT reconstruction was performed using uniform and nonuniform attenuation correction and collimator blurring corrections. Recovery values (phantom data) or average-specific uptake ratios (patient data) for the different reconstructions were compared at similar noise levels. Results. For the phantom data, improved recovery was found with nonuniform attenuation correction and collimator blurring corrections, with further improvement when performed together. However, for patient data the highest average specific uptake ratio was obtained using collimator blurring correction without nonuniform attenuation correction, probably due to subtle SPECT-CT misregistration. Conclusions. This study suggests that an optimal brain SPECT reconstruction (in terms of the lowest bias) in patients would include a correction for collimator blurring and uniform attenuation correction.

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