Search Results - "Koral, K.F."

Comparison of 3-D OSEM versus 1-D SAGE for focal total-activity quantification in I-131 SPECT with HE collimation by Koral, K.F., Yendiki, A., Qiang Lin, Dewaraja, Y.K.

“…A three-dimensional (3-D) ordered-subset expectation maximization (OSEM) reconstruction algorithm used fits to the average behavior of the I-131…”
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Determining total I-131 activity within a VoI using SPECT, a UHE collimator, OSEM, and a constant conversion factor by Koral, K.F., Yendiki, A., Lin, Q., Dewaraja, Y.K., Fessler, J.A.

“…Accurate determination of activity within a volume of interest is needed during radiopharmaceutical therapies. Single-photon emission computed…”
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Quantitative I-131 SPECT reconstruction using CT side information from hybrid imaging by Dewaraja, Y.K., Koral, K.F., Fessler, J.A.

“…A penalized-likelihood (PL) SPECT reconstruction method using a modified regularizer that accounts for anatomical boundary side information was implemented to…”
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NATURE OF RINGING ARTIFACTS IN SPECT RECONSTRUCTION AND THEIR REDUCTION BY THE USE OF SIDE INFORMATION by Jia Li, Koral, K.F.

“…ML-EM iterative reconstruction algorithms tend towards ringing artifacts, and high noise, after a large number of iterations just as filtered backprojection…”
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Accurate modeling of nuclear-medicine collimators in Monte Carlo simulation of high-energy photons by Wilderman, S.J., Dewaraja, Y., Koral, K.F.

“…Monte Carlo (MC) simulation of nuclear medicine imaging is more difficult for procedures employing 131I than for those using 99mTc because of the higher…”
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An algorithm to adjust a rigid CT-SPECT fusion so as to maximize tumor counts from CT VoI in I-131 therapies by Jia Li, Koral, K.F.

“…The accuracy of the estimate of tumor I-131 activity in therapy patients using CT-SPECT fusion is difficult to establish. In our work, we have had the…”
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A regularized deconvolution-fitting method for Compton-scatter correction in SPECT by Wang, X., Koral, K.F.

“…A method is presented for estimating the Compton-scatter component within the photopeak for local energy spectra measured by an Anger camera in SPECT. Assuming…”
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An overview of imaging techniques and physical aspects of treatment planning in radioimmunotherapy by Leichner, P K, Koral, K F, Jaszczak, R J, Green, A J, Chen, G T, Roeske, J C

“…Planar and tomographic imaging techniques and methods of treatment planning in clinical radioimmunotherapy are reviewed. In clinical trials, the data needed…”
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Effect of including detector response in SPECT quantification of focal I-131 therapy by Koral, K.F., Qiang Lin, Akhtar, A., Jia Li, Dewaraja, Y.K., Fessler, J.A.

“…With a regularized strip-integral (1D) SAGE reconstruction, circular-orbit SPECT estimates of phantom focal 131-I activity vary with changes in the level of…”
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Correction for patient Compton scattering--current status by Koral, K F

“…Short communication…”
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SPRINT II: a second generation single photon ring tomograph by Rogers, W.L., Clinthorne, N.H., Shao, L., Chiao, P., Ding, Y., Stamos, J.A., Koral, K.F.

“…SPRINT II is a stationary detector ring tomograph designed for brain imaging. Eleven two-dimensional sodium iodide camera modules that use maximum-likelihood…”
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Changes in local energy spectra with SPECT rotation for two Anger cameras by Koral, K.F., Luo, J.Q., Ahmad, W., Buchbinder, S., Ficaro, E.P.

“…We investigated the shift of local energy spectra with SPECT rotation for the GE 400 AT and the Picker Prism 3006 tomographs. A Co-57 flood source was taped to…”
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Update on HE vs UHE collimation for focal total-activity quantification in I-131 SPECT using 3D OSEM by Koral, K.F., Yendiki, A., Lin, V., Dewaraja, Y.K., Fessler, J.A.

“…We calibrated a scintillation camera for the counts-to-activity conversion factor, CF, by measuring a phantom consisting of a sphere containing a known 131-I…”
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Object-dependent performance comparison of two iterative reconstruction algorithms by Stamos, J.A., Rogers, W.L., Clinthorne, N.H., Koral, K.F.

“…Iterative algorithms are of interest for both positron-emission tomography (PET) and single-photon-emission computed tomography (SPECT) because they permit…”
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sup 131/I tumor quantification: a new background-adaptive method by Koral, K.F., Dewaraja, Y., Shuhong Lin

“…The authors examine the accuracy of focal activity /sup 131/I quantification using either one of two new methods which don't explicitly employ…”
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Measurement of Compton scattering in phantoms by germanium detectors by Zasadny, K.R., Koral, K.F., Floyd, C.E. Jr, Jaszczak, R.J.

“…Quantitative Anger-camera tomography requires correction for Compton scattering. The Anger camera spectral-fitting technique can measure scatter fractions at…”
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Recursive calculation of the two-dimensional maximum likelihood position estimate for a scintillation camera by Liu, X., Clinthorne, N.H., Shao, L., Koral, K.F., Rogers, W.L.

“…Maximum likelihood position estimation of a scintillation event in a gamma-ray imaging detector has been described using two independent one-dimensional…”
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A parallel Monte Carlo code for planar and SPECT imaging: implementation, verification and applications in /sup 131/I SPECT by Dewaraja, Y.K., Ljungberg, M., Majumdar, A., Bose, A., Koral, K.F.

“…This paper reports the implementation of the SIMIND Monte Carlo code on a IBM SP2 distributed memory parallel computer. Basic aspects of running Monte Carlo…”
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Experimental evaluation of a modular scintillation camera for SPECT by Rogers, W.L., Clinthorne, N.H., Shao, L., Koral, K.F.

“…A modular scintillation camera has been constructed for use in a ring-type single photon tomograph for nuclear medicine. Its performance has been…”
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A Macintosh-based multi-energy data acquisition system for gamma cameras by Buchbinder, S., Clinthorne, N.H., Petrick, N., Wang, X., Koral, K.F.

“…A multi-energy data acquisition system based on the Macintosh II computer and a commercial ADC subsystem has been developed to allow the application of…”
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