نتایج جستجو برای: simultaneous spect
تعداد نتایج: 127383 فیلتر نتایج به سال:
Hybrid imaging techniques provide enhanced visualization of biological targets by synergistically combining multiple imaging modalities, thereby providing information on specific aspects of structure and function, which is difficult to obtain by a single imaging modality. Advances in the field of hybrid imaging have resulted in the recent approval of PET/magnetic resonance (MR) imaging by the U...
There is increasing clinical use of combined positron emission tomography and MRI, but to date there has been no clinical system developed capable of simultaneous single-photon emission computed tomography (SPECT) and MRI. There has been development of preclinical systems, but there are several challenges faced by researchers who are developing a clinical prototype including the need for the sy...
The registration of computed tomography (CT) and nuclear medicine (NM) images can substantially enhance patient diagnosis as it allows for the fusion of anatomical and functional information, as well as the attenuation correction of NM images. However, irrespective of the method used, registration accuracy depends heavily on the characteristics of the images that are registered and the degree o...
BACKGROUND A brain single-photon emission computed tomography (SPECT) system using cadmium telluride (CdTe) solid-state detectors was previously developed. This CdTe-SPECT system is suitable for simultaneous dual-radionuclide imaging due to its fine energy resolution (6.6 %). However, the problems of down-scatter and low-energy tail due to the spectral characteristics of a pixelated solid-state...
Emission tomography provides three-dimensional, quantitative images of the distribution of radiotracers used to mark physiological, metabolic, or pathological processes. Quantitative single photon emission computed tomography (SPECT) requires correction for the image-degrading effects due to photon attenuation and scatter. Phantom experiments have shown that radioactive concentrations can be as...
Abstract Multi-tracer imaging can provide useful information in the definitive diagnosis and research of medical, biological, pharmaceutical sciences. Single-photon emission computed tomography (SPECT) is one nuclear medicine modalities widely used for or medical has a multi-tracer capability. One drawbacks crosstalk from other gamma rays, which affects reconstructed image. Scattering correctio...
We show that under a certain non-cancellation condition the attenuated Radon transform uniquely determines piecewise constant attenuation $ and C^2 source density f with jumps over real analytic boundaries possibly having corners. also look at numerical examples in which fails unique reconstruction of multi-bang still appears to be possible although not yet explained by theoretical results.
A prototype clinical brain single-photon emission computed tomography (SPECT) insert has been designed for use in simultaneous SPECT/MRI. The system utilizes novel slit-slat collimators which, like pinhole collimators, suffers from parallax errors due to the large incident angle of photons. statistical algorithm developed determine depth-of-interaction (DOI) with a view improving image performa...
Advances in radiology have helped in early diagnosis, surveillance and proper management of disease processes. SPECT scintigraphy is an imaging modality that helps in the detection & diagnosis of facial & skull osteomyelitis and is also useful for detecting silent lesions. Pentoxifylline-tocopherol together helps in faster healing of diseased bone. Pentoxifylline reduces blood viscosity and thu...
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