Search Results - "Stearns, C. W."

Measured count-rate performance of the Discovery STE PET/CT scanner in 2D, 3D and partial collimation acquisition modes by Macdonald, L R, Schmitz, R E, Alessio, A M, Wollenweber, S D, Stearns, C W, Ganin, A, Harrison, R L, Lewellen, T K, Kinahan, P E

“…We measured count rates and scatter fraction on the Discovery STE PET/CT scanner in conventional 2D and 3D acquisition modes, and in a partial collimation mode…”
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Performance Characteristics of a Whole-Body PET Scanner by DeGrado, Timothy R, Turkington, Timothy G, Williams, J. Jay, Stearns, Charles W, Hoffman, John M, Coleman, R. Edward

“…This study characterizes the performance of a newly developed whole-body PET scanner (Advance, General Electric Medical Systems, Milwaukee, WI). The scanner…”
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Imaging and dosimetric errors in 4D PET/CT-guided radiotherapy from patient-specific respiratory patterns: a dynamic motion phantom end-to-end study by Bowen, S R, Nyflot, M J, Herrmann, C, Groh, C M, Meyer, J, Wollenweber, S D, Stearns, C W, Kinahan, P E, Sandison, G A

“…Effective positron emission tomography / computed tomography (PET/CT) guidance in radiotherapy of lung cancer requires estimation and mitigation of errors due…”
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Investigation of the count rate performance of General Electric Advance positron emission tomograph by Lewellen, T.K., Kohlmyer, S.G., Miyaoka, R.S., Schubert, S., Stearns, C.W.

“…A series of 2D and 3D count rate measurements have been carried out on the Advance PET system. The measurements include: NEMA standard protocols; simultaneous…”
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Dead-time correction for an orbiting rod normalization in a cylindrical PET system by Wollenweber, S.D., McDaniel, D.L., Stearns, C.W.

“…Orbiting rod source coincidence acquisitions may exhibit a significant amount of dead-time, depending on the system geometry and the rod source activity. This…”
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Oversampled filters for quantitative volumetric PET reconstruction by Stearns, C W, Crawford, C R, Hu, H

“…Three-dimensional filtered backprojection uses filters generally specified in the Fourier domain. Implementing these filters by direct sampling in the Fourier…”
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The impact of time-of-flight timing resolution using clinical FDG patient data by Wollenweber, S. D., McDaniel, D. L., Tohme, M., Stearns, C. W.

“…The goal of the work was to understand the impact on clinical measures of timing resolution for time-of-flight (TOF) fully-3D iterative reconstruction. We…”
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Impact of PSF modelling on the convergence rate and edge behaviour of EM images in PET by Thielemans, K, Asma, E, Ahn, S, Manjeshwar, R M, Deller, T, Ross, S G, Stearns, C W, Ganin, A

“…EM reconstructions with point-spread-function (PSF) modelling is performed to increase the spatial resolution in PET images. These images exhibit slower…”
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NECR analysis of 3D brain PET scanner designs by Stearns, C.W., Cherry, S.R., Thompson, C.J.

“…A dedicated 3D brain PET scanner has several advantages, most notably increased sensitivity, over a whole body scanner for neurological studies. However, brain…”
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A noise equivalent counts approach to transmission imaging and source design by Stearns, C.W., Wack, D.C.

“…Noise equivalent counts are a convenient and effective means to assess PET emission image quality. The method is extended to include the effects of…”
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Accelerated image reconstruction for a cylindrical positron tomograph using Fourier domain methods by Stearns, C.W., Chesler, D.A., Brownell, G.L.

“…The authors present a method to reconstruct projection images through assembly in the Fourier domain, rather than by backprojection. By bypassing the…”
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Cylindrical PET detector design by Burnham, C.A., Kaufman, D.E., Chesler, D.A., Stearns, C.W., Wolfson, D.R., Brownell, G.L.

“…A cylindrically shaped high-resolution PET (positron-emission-tomography) detector that uses cross-plane coincidence events is being developed. A 2-D analog…”
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A low-Z PET detector by Burnham, C.A., Kaufman, D.E., Chesler, D.A., Stearns, C.W., Correia, J.A., Brownell, G.L.

“…In order to examine the potential of low-Z detector materials for PET (positron emission tomography), a small field imaging system using plastic detectors has…”
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Simulation studies for cylindrical positron tomography by Stearns, C.W., Burnham, C.A., Chesler, D.A., Brownell, G.L.

“…A VMEbus-based microcomputer system has been used to implement a model for simulation of the flux of gamma rays to cylindrical PET…”
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Combined simulations for evaluation of 2D and 3D wholebody PET imaging protocols by Schmitz, R.E., Kinahan, P.E., Harrison, R.L., Karp, J.S., Surti, S., Stearns, C.W., Badawi, R.D., Lewellen, T.K.

“…Full characterization or optimization of 2D and 3D PET imaging protocols requires many independent but identically distributed realizations, which can be…”
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Incorporating count-rate dependence into model-based PET scatter estimation by Stearns, C. W., Manjeshwar, R. M.

“…Pile-up in a PET detector changes the sensitivity of the detector to unscattered and scattered annihilation photons differently. If the detection of a 511 keV…”
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Randoms from singles estimation for long PET scans by Stearns, C. W., Lonn, A. H. R.

“…We have previously described the algorithm for estimating the contribution of random coincidences to the PET dataset using a set of singles counters, one per…”
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Generation of the Acquisition-Specific NEC (AS-NEC) Curves to Optimize the Injected Dose in 3D F-FDG Whole Body PET Studies by Danna, M, Lecchi, M, Bettinardi, V, Gilardi, M, Stearns, C, Lucignani, G, Fazio, F

“…The results show that the average activities at the acquisition time corresponding to the NEC-p were comparable for the three BMI classes: 336.7 MBqMBqMBqfor…”
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Calibration of detector sensitivity in positron cameras by Chesler, D.A., Stearns, C.W.

“…An improved method for calibrating detector sensitivities in a positron camera has been developed. The calibration phantom is a cylinder of activity placed…”
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Performance Characteristics of a Newly Developed PET/CT Scanner Using NEMA Standards in 2D and 3D Modes by Mawlawi, Osama, Podoloff, Donald A, Kohlmyer, Steve, Williams, John J, Stearns, Charles W, Culp, Randall F, Macapinlac, Homer

“…This study evaluates the 2-dimensional (2D) and 3-dimensional (3D) performance characteristics of a newly developed PET/CT scanner using the National…”
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