Search Results - "Gifford, Howard C."

Penalized Maximum Likelihood Reconstruction for Improved Microcalcification Detection in Breast Tomosynthesis by Das, M, Gifford, H C, O'Connor, J M, Glick, S J

“…We examined the application of an iterative penalized maximum likelihood (PML) reconstruction method for improved detectability of microcalcifications (MCs) in…”
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Visual-search observers for assessing tomographic x-ray image quality by Gifford, Howard C., Liang, Zhihua, Das, Mini

“…Purpose: Mathematical model observers commonly used for diagnostic image-quality assessments in x-ray imaging research are generally constrained to relatively…”
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A visual-search model observer for multislice-multiview SPECT images by Gifford, Howard C.

“…Purpose: Mathematical model observers are intended for efficient assessment of diagnostic image quality, but model-observer studies often are not…”
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Analyzing visual-search observers using eye-tracking data for digital breast tomosynthesis images by Jiang, Zhengqiang, Das, Mini, Gifford, Howard C

“…Visual-search (VS) model observers have the potential to provide reliable predictions of human-observer performance in detection-localization tasks. The…”
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Task Equivalence for Model and Human-Observer Comparisons in SPECT Localization Studies by Sen, Anando, Kalantari, Faraz, Gifford, Howard C.

“…While mathematical model observers are intended for efficient assessment of medical imaging systems, their findings should be relevant for human observers as…”
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Inter‐laboratory comparison of channelized hotelling observer computation by Ba, Alexandre, Abbey, Craig K., Baek, Jongduk, Han, Minah, Bouwman, Ramona W., Balta, Christiana, Brankov, Jovan, Massanes, Francesc, Gifford, Howard C., Hernandez‐Giron, Irene, Veldkamp, Wouter J. H., Petrov, Dimitar, Marshall, Nicholas, Samuelson, Frank W., Zeng, Rongping, Solomon, Justin B., Samei, Ehsan, Timberg, Pontus, Förnvik, Hannie, Reiser, Ingrid, Yu, Lifeng, Gong, Hao, Bochud, François O.

“…Purpose The task‐based assessment of image quality using model observers is increasingly used for the assessment of different imaging modalities. However, the…”
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Accounting for anatomical noise in search-capable model observers for planar nuclear imaging by Sen, Anando, Gifford, Howard C

“…Model observers intended to predict the diagnostic performance of human observers should account for the effects of both quantum and anatomical noise. We…”
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Assessing CT acquisition parameters with visual-search model observers by Karbaschi, Zohreh, Gifford, Howard C

“…A principal difference between the channelized Hotelling (CH) and visual-search (VS) model observers is how they respond to noise texture in images. We…”
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Evaluation of a variable dose acquisition technique for microcalcification and mass detection in digital breast tomosynthesis by Das, Mini, Gifford, Howard C., O’Connor, J. Michael, Glick, Stephen J.

“…In this article the authors evaluate a recently proposed variable dose (VD)-digital breast tomosynthesis (DBT) acquisition technique in terms of the detection…”
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LROC Investigation of Three Strategies for Reducing the Impact of Respiratory Motion on the Detection of Solitary Pulmonary Nodules in SPECT by Smyczynski, Mark S., Gifford, Howard C., Dey, Joyoni, Lehovich, Andre, McNamara, Joseph E., Segars, W. Paul, King, Michael A.

“…The objective of this investigation was to determine the effectiveness of three motion reducing strategies in diminishing the degrading impact of respiratory…”
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Modeling the Respiratory Motion of Solitary Pulmonary Nodules and Determining the Impact of Respiratory Motion on Their Detection in SPECT Imaging by Smyczynski, Mark S., Gifford, Howard C., Lehovich, Andre, McNamara, Joseph E., Segars, W. Paul, Hoffman, Eric A., Tsui, Benjamin M. W., King, Michael A.

“…The objectives of this investigation were to model the respiratory motion of solitary pulmonary nodules (SPN) and then use this model to determine the impact…”
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A comparison of human and model observers in multislice LROC studies by Gifford, H.C., King, M.A., Pretorius, P.H., Wells, R.G.

“…Model and human observers have been compared in a series of localization receiver operating characteristic (LROC) studies involving single-slice and multislice…”
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Use of three-dimensional Gaussian interpolation in the projector/backprojector pair of iterative reconstruction for compensation of known rigid-body motion in SPECT by Bing Feng, Gifford, H.C., Beach, R.D., Guido Boening, Gennert, M.A., King, M.A.

“…Due to the extended imaging times employed in single photon emission computed tomography (SPECT) and positron emission tomography (PET), patient motion during…”
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Assessment of scatter compensation strategies for (67)Ga SPECT using numerical observers and human LROC studies by Farncombe, Troy H, Gifford, Howard C, Narayanan, Manoj V, Pretorius, P Hendrik, Frey, Eric C, King, Michael A

“…67Ga citrate is an oncologic SPECT imaging agent often used to diagnose or stage patients with non-Hodgkin's lymphoma. As (67)Ga decay involves the emission of…”
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Channelized Hotelling and Human Observer Correlation for Lesion Detection in Hepatic SPECT Imaging by Gifford, Howard C, King, Michael A, de Vries, Daniel J, Soares, Edward J

“…Mathematic "model" observers that predict human performance are of interest in medical imaging as substitutes in psychophysical studies. We have examined the…”
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An Adaptive Approach to Decomposing Patient-Motion Tracking Data Acquired During Cardiac SPECT Imaging by Beach, Richard D., Depold, Hans, Boening, Guido, Bruyant, Philippe P., Feng, Bing, Gifford, Howard C., Gennert, Michael A., Nadella, Suman, King, Michael A.

“…Patient motion during cardiac SPECT imaging can cause diagnostic imaging artifacts. We have implemented a Neural Network (NN) approach to decompose monitored…”
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An evaluation of iterative reconstruction strategies based on mediastinal lesion detection using hybrid Ga-67 SPECT images by Pereira, Nicholas F., Gifford, Howard C., Pretorius, P. Hendrik, Smyczynski, Mark, Licho, Robert, Schneider, Peter, Farncombe, Troy, King, Michael A.

“…Using psychophysical studies, the authors have evaluated the effectiveness of various strategies for compensating for physical degradations in SPECT imaging…”
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Body Deformation Correction for SPECT Imaging by Songxiang Gu, McNamara, J.E., Mitra, J., Gifford, H.C., Johnson, K., Gennert, M.A., King, M.A.

“…Patient motion degrades the quality of SPECT studies. Body bend and twist are types of patient deformation, which may occur during SPECT imaging, and which has…”
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Body deformation correction for SPECT imaging by Songxiang Gu, McNamara, Joseph E., Mitra, Joyeeta, Gifford, Howard C., Johnson, Karen, Gennert, Michael A., King, Michael A.

“…Body bending and body twisting are kinds of non- rigid and non-periodic patient motion which may occur during SPECT imaging. We have developed a body-…”
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Choosing anatomical-prior strength for MAP SPECT reconstruction to maximize lesion detectability by Lehovich, Andre, Gifford, Howard C., Schneider, Peter B., King, Michael A.

“…With the widespread availability of SPECT/CT systems it has become feasible to incorporate prior knowledge about anatomical boundaries into the SPECT…”
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