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Devices aiming at combined Positron Emission Tomography (PET) and Magnetic Resonance Imaging (MRI) to enable simultaneous PET/MR image acquisition have to fulfill demanding requirements to avoid mutual magnetic- as well as electromagnetic-field-related interferences which lead to image quality degradation. Particularly Radio-Frequency (RF)-field-related interferences between PET and MRI may lead to...
Because blood oxygen level dependent (BOLD) functional magnetic resonance imaging (fMRI) pulse sequences have rapidly changing high field gradients, almost all currently available equipment which measure and record the response of a patient to visual or audio stimuli in fMRI employ fiber-optics based systems. In this work we introduce a simple and low cost patient response set up which does not require...
This paper reports our results in developing a simple MRI system for teaching the basics of MR Engineering at the undergraduate or graduate level. LabVIEW data acquisition cards were used for generating and digitizing the RF signals and controlling gradients and transmit/receive and blanking switches. A very inexpensive and simple magnet reported previously by Sahakian was used to enable simple, projection...
A Geiger-mode avalanche photodiode (GAPD) array-based MRI compatible PET is being developed in our laboratory. The purpose of this study is to develop filtering methods for PET event signals contaminated by RF pulses for simultaneous PET-MR imaging. The detector for the MRI compatible PET was composed of LYSO scintillators coupled with GAPD arrays. PET signal acquisition was implemented by a FPGA-based...
The authors have developed techniques which may be performed on any standard clinical imager and produce complete data sets of 16 time frames in each of eight contiguous slices in a total acquisition time of 1024 heartbeats. The limits inherent in the acquisition procedure are outlined. The authors have found that 3.0 mm in-plane resolution is sufficient, and consequently, they need only perform 64...
Baseline removal by subtraction, in which each second-excitation RF pulse changes its polarity, can be successfully used in a variety of data processing applications in real time by appropriately coding the odd and even excitations. The authors demonstrate this technique in: (1) fast fat/water imaging utilizing phase modulation of the spectral components and (2) the detection of lactate in vivo by...
A description is given of an MRI (magnetic resonance imaging) instrumentation system, and the advantages of a distributed processing approach to its implementation are discussed. Some of the functions are described, and it is shown that local intelligence in each of the units is essential. The decomposition of such complex instrumentation problems can ease the implementation and enables equipment...
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