Background: P-glycoprotein [Pgp] dysfunction may be involved in neurodegenerative diseases, such as Alzheimer’s disease, and in drug resistant epilepsy. Positron emission tomography using the Pgp substrate tracer (R)-[C] verapamil enables in vivo quantification of Pgp function at the human blood-brain barrier. Knowledge of test-retest variability is important for assessing changes over time or ...

BACKGROUND Positron emission tomography (PET) studies using 15O-labeled CO2, O2, and CO have been used in humans to evaluate cerebral blood flow (CBF), the cerebral oxygen extraction fraction (OEF), and the cerebral metabolic rate of oxygen (CMRO2) and cerebral blood volume (CBV), respectively. In preclinical studies, however, PET studies using 15O-labeled gases are not widely performed because...

BACKGROUND Positron emission tomography (PET) with (18)F-3'-deoxy-3'-fluorothymidine ([(18)F]FLT) can be used to assess tumour proliferation. A kinetic-filtering (KF) classification algorithm has been suggested for segmentation of tumours in dynamic [(18)F]FLT PET data. The aim of the present study was to evaluate KF segmentation and its test-retest performance in [(18)F]FLT PET in non-small ce...

Received 12/27/2000; revised 2/26/2001; accepted 3/14/2001. For correspondence or reprints contact: Habib Zaidi, Ph.D., Division of Nuclear Medicine, Geneva University Hospital, CH-1211 Geneva, Switzerland. Tel: 41 22 372 72 58, Fax: 41 22 372 71 69, E-mail: [email protected] A new method to assess the scatter component in positron emission tomography (PET) based on estimating the low-freque...

BACKGROUND Accurate staging is crucial for treatment selection and prognosis prediction in patients with rectal cancer. Point spread function (PSF) reconstruction can improve spatial resolution and signal-to-noise ratio of PET imaging. The aim of this study was to evaluate the effectiveness of 18F-FDG PET/CT with PSF reconstruction for initial staging in rectal cancer compared with conventional...

Abstract Prostate cancer is one of the most common cancers affecting men. Bone scan part staging modality commonly used to evaluate bone metastasis. A with diffused increased skeletal tracer uptake relative soft tissue, combined faint renal activity known as a superscan. However, primary concern are false negatives associated scans, where diffuse metastasis indistinguishable on superscans. In t...

Institute of Biophysics and Biomedical Engineering, Science Faculty of University of Lisbon, Portugal The Siemens BrainPET scanner is a hybrid MRI/PET system. PET images are prone to motion artefacts which degrade the image quality. Therefore, motion correction is essential. The library PRESTO converts motion-corrected LORs into highly accurate generic projection data [1], providing high-resolu...