Whole-body PET/CT scanners are important clinical and research tools to study tracer distribution throughout the body. In whole-body studies, respiratory motion results in image artifacts. We have previously demonstrated for brain imaging that, when provided with accurate motion data, event-by-event correction has better accuracy than frame-based methods. Therefore, the goal of this work was to...

Gated cardiac SPECT imaging has been widely used in the evaluation of cardiac functions. The acquired fourdimensional (4D) sinogram data have both inter-frame correlation among the time sequence and intra-frame correlation within each 3D frame. The unique features of Karhune-Loève (KL) transform for de-correlating the data sequence for noise reduction, feature extraction, etc, have been well re...

Convolutional neural networks (CNNs) have recently achieved remarkable performance in positron emission tomography (PET) image reconstruction. In particular, CNN-based direct PET reconstruction, which directly generates the reconstructed from sinogram, has potential applicability to enhancements because it does not require reconstruction algorithms, often produce some artifacts. However, these ...

Reliable attenuation correction methods in PET require accurate determination of the attenuation map (μmap), which represents the spatial distribution of linear attenuation coefficients (LACs) at 511 keV for the region under study. Since CT image pixel intensities are directly related to the LAC of the corresponding tissue calculated from the effective CT energy, the μmap at 511 keV can be dire...

Intra-abdominal abscess and an intractable abdominal wall sinus forty years after splenectomy is rare, which has not been described previously in the surgical literature. We report the management of a patient who had presented with an intractable sinus on his left hypochondrium forty years after having undergone splenectomy and cholecystectomy, which persisted for more than two years despite re...

Objectives. Pyriform sinus fistulae arise from disturbances in the development of the fetal third and fourth branchial pouches and are predominantly found on the left side. We report the rare case of a right-sided pyriform sinus fistula presenting as a lateral neck abscess. Study Design. Case report. Methods. A 24-year-old woman presented with a two-week history of right-sided neck abscess. A f...