Search Results - "Julyan, P.J."

EM algorithm system modeling by image-space techniques for PET reconstruction by Reader, A.J., Julyan, P.J., Williams, H., Hastings, D.L., Zweit, J.

“…Methodology for PET system modeling using image-space techniques in the expectation maximization (EM) algorithm is presented. The approach, applicable to both…”
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One-pass list-mode EM algorithm for high-resolution 3-D PET image reconstruction into large arrays by Reader, A.J., Ally, S., Bakatselos, F., Manavaki, R., Walledge, R.J., Jeavons, A.P., Julyan, P.J., Sha Zhao, Hastings, D.L., Zweit, J.

“…High-resolution three-dimensional (3-D) positron emission tomography (PET) scanners with high count rate performance, such as the quad-high density avalanche…”
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Noise Properties of Four Strategies for Incorporation of Scatter and Attenuation Information in PET Reconstruction Using the EM-ML Algorithm by Tamal, M., Reader, A.J., Markiewicz, P.J., Julyan, P.J., Hastings, D.L.

“…Conventional methods for dealing with attenuation and scatter in PET can limit the reconstructed image quality, particularly if the attenuating medium is large…”
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Accelerated list-mode EM algorithm by Reader, A.J., Manavaki, R., Zhao, S., Julyan, P.J., Hastings, D.L., Zweit, J.

“…List-mode data preserves all sampling information in three-dimensional (3-D) PET imaging and can reduce storage requirements for short-time frame acquisitions…”
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Adaptive correction of scatter and random events for 3-D backprojected PET data by Reader, A.J., Sha Zhao, Julyan, P.J., Hastings, D.L., Zweit, J.

“…Backprojected images offer compact and accurate storage of three-dimensional (3-D) positron emission tomography (PET) data and so are potentially very suited…”
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Comparative Study With New Accuracy Metrics for Target Volume Contouring in PET Image Guided Radiation Therapy by Shepherd, Tony, Teras, Mika, Beichel, Reinhard R., Boellaard, Ronald, Bruynooghe, Michel, Dicken, Volker, Gooding, Mark J., Julyan, Peter J., Lee, John A., Lefevre, Sébastien, Mix, Michael, Naranjo, Valery, Wu, Xiaodong, Zaidi, Habib, Zeng, Ziming, Minn, Heikki

“…The impact of positron emission tomography (PET) on radiation therapy is held back by poor methods of defining functional volumes of interest. Many new…”
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Performance characteristics of a small animal PET camera for molecular imaging by Hastings, D.L., Reader, A.J., Julyan, P.J., Zweit, J., Jeavons, A.P., Jones, T.

“…The performance of a novel type of animal PET camera, the quad High-Density Avalanche Chamber (HIDAC) was assessed for a non-rotating 16-module system. Spatial…”
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SUVpeak: a new parameter for quantification of uptake in FDG PET by Julyan, P.J., Taylor, J.H., Hastings, D.L., Williams, H.A., Zweit, J.

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Bias in iterative reconstruction of low-statistics PET data: Benefits of a resolution model by Walker, M.D., Julyan, P.J., Talbot, P.S., Jones, T., Matthews, J.C.

“…Ordered-subset expectation maximization (OSEM) is a widely used method of reconstructing PET data. Several authors have reported bias when reconstructing…”
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Evaluation of annexin V labelled with the positron emitter 124I for PET imaging of apoptosis by Hastings, D.L., Dekker, B., Keen, H., Disley, L., Lyons, S., Julyan, P.J., Reader, A.J., Smith, N., Zweit, J., Watson, A.

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Impact of Scatter Modeling Error on 3D Maximum Likelihood Reconstruction in PET by Tamal, M., Markiewicz, P.J., Julyan, P.J., Hastings, D.L., Reader, A.J.

“…In statistical image reconstruction for PET, the reconstructed image quality depends on the system matrix as well as the scatter correction method used,…”
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Region-based Efficiency Correction for the High-Resolution quad-HIDAC PET scanner by Maynez, L.O., Julyan, P.J., Hastings, D.L., Reader, A.J.

“…The very high resolution quad-HIDAC PET scanner has four detector banks each with four planar high density avalanche chambers, capable of collecting billions…”
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High Accuracy Multiple Order Scatter Model for 3D Whole Body PET by Markiewicz, P.J., Tamal, M., Julyan, P.J., Hastings, D.L., Reader, A.J.

“…A technique for modelling multiple Compton scatter as the absolute probabilities which relate the image space to the projection space in 3D whole body PET…”
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Noise properties of four strategies for incorporation of scatter and attenuation information in PET reconstruction by Tamal, M., Reader, A.J., Markiewicz, P.J., Hastings, D.L., Julyan, P.J.

“…Conventional methods for dealing with attenuation and scatter can degrade the reconstructed image quality, particularly if the attenuating medium is large (as…”
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Towards an accurate voxel-based analytic unified scatter and attenuation system model for 3D PET by Markiewicz, P.J., Reader, A.J., Tamal, M., Julyan, P.J., Hastings, D.L.

“…A voxel-based approach to 3D PET analytic system modeling which projects the unit sphere of Klein-Nishina probabilities onto the cylindrical detection sphere,…”
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Regularized one-pass list-mode EM algorithm for high resolution 3D PET image reconstruction into large arrays by Reader, A.J., Ally, S., Bakatselos, F., Manavaki, R., Walledge, R.J., Jeavons, A.P., Julyan, P.J., Sha Zhao, Hastings, D.L., Zweit, J.

“…High resolution 3D PET scanners with high count rate performance, such as the quad-HIDAC, place new demands on image reconstruction algorithms due to the large…”
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An attenuation measurement technique for rotating planar detector positron tomographs by McNeil, P A, Julyan, P J, Parker, D J

“…This paper presents a new attenuation measurement technique suitable for rotating planar detector positron tomographs. Transmission measurements are made using…”
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EM algorithm resolution modeling by image-space convolution for PET reconstruction by Reader, A.J., Julyan, P.J., Williams, H., Hastings, D.L., Zweit, J.

“…A method for modeling and recovering resolution in the expectation maximization (EM) algorithm via two image-space convolutions per iteration is presented. The…”
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Adaptive correction of scatter and random events for 3D backprojected PET data by Reader, A.J., Sha Zhao, Julyan, P.J., Hastings, D.L., Zweit, J.

“…Backprojected images offer compact and accurate storage of 3D PET data, and so are potentially very suited to high resolution 3D PET scanners when carrying out…”
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Quad-HIDAC PET: comparison of four image reconstruction techniques for high resolution imaging by Walledge, R.J., Manavaki, R., Reader, A.J., Jeavons, A.P., Julyan, P.J., Sha Zhao, Hastings, D.L., Zweit, J.

“…The quad-HIDAC PET scanner offers unparalleled high resolution PET imaging capability (<1 mm), combined with notable count rate performance (400 kcps) and…”
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