Purpose. Striatal single photon emission computed tomography (SPECT) imaging of the dopaminergic system is becoming increasingly used for clinical and research studies. The question about the value of nonuniform attenuation correction has become more relevant with the increasing availability of hybrid SPECT-CT scanners. In this study, the value of nonuniform attenuation correction and correctio...

Background: This study aims to investigate radiation beam geometry of Cyberknife beam and change in dosimetric characteristics of six megavoltage (6MV) flattening filter free (FFF) beam after passing through high density cadmium free compensator alloy.Material and Methods: In this experimental study, changes in FFF beam dosimetric characteristics after passing through compensator alloy wa...

Transmission of classical information using quantum objects such as polarized photons is studied. The classical (Shannon) channel capacity and its relation to quantum (von Neumann) channel capacity is investigated for various receiver arrangements. A quantum channel with transmission impairment caused by attenuation and random polarization noise is considered. It is shown that the maximal (von ...

Attenuation correction is an essential component of the long chain of data correction techniques required to achieve the full potential of quantitative positron emission tomography (PET) imaging. The development of combined PET/magnetic resonance imaging (MRI) systems mandated the widespread interest in developing novel strategies for deriving accurate attenuation maps with the aim to improve t...

There is a growing body of evidence for the use of FDG in the differentiation of malignant from benign disease, staging and grading of malignant disease, differentiating recurrent or residual disease from therapy induced changes, and monitoring the response to therapy. Depending on the clinical question and type of equipment available, the FDG imaging procedure may include: A. Limited Field Tom...

Avalanche photo-detection is commonly used in applications which require single-photon sensitivity. We examine the limits of using avalanche photodiodes (APD) for characterizing photon statistics at high data rates. To identify the regime of linear APD operation, we employ a ps-pulsed diode laser with variable repetition rates between 0.5 MHz and 80 MHz. We modify the mean optical power of the ...