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Circuit Topology with Low Loss Bypass Path for Proton Signals

IP.com Disclosure Number: IPCOM000169593D
Publication Date: 2008-Apr-23
Document File: 6 page(s) / 105K

Publishing Venue

The IP.com Prior Art Database


An exemplary switch topology configured to aid a MNS module to operate in the bypass mode and/or frequency conversion mode is presented. The switch circuit is configured to enable a low loss bypass path for signals with reduced losses.

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Circuit Topology with Low Loss Bypass Path for Proton Signals


[0001]             The invention relates generally to imaging systems, and more particularly to switching circuits for the imaging systems.  

[0002]             Diagnostic imaging has emerged into an essential aspect of patient care.  Medical images that are obtained during a diagnostic imaging session have evolved as tools that allow a clinician non-invasive means to view anatomical cross-sections of internal organs, tissues, bones and other anatomical regions of a patient.  More particularly, the medical images serve the clinician in diagnosis of disease states, determination of suitable treatment options and/or monitoring the effects of treatment, to name a few.  As will be appreciated, medical images may be obtained from a broad spectrum of imaging modalities, such as, but not limited to computed tomography (CT) imaging, ultrasound imaging, magnetic resonance (MR) imaging, digital mammography, X-ray imaging, nuclear medicine imaging, or positron emission tomography (PET) imaging. 

[0003]             As will be appreciated, when included in a 3T DVMR receive chain, a Multinuclear Spectroscopy (MNS) module is configured to provide a means of converting RF receive signals at frequencies other than the Proton frequency (i.e., MNS frequencies in a range from about 15 MHz to about 121 MHz), to the Proton frequency (127.72 MHz) for subsequent routing to available receivers in the RF Hub.  For the Proton receive signals, this frequency conversion function is bypassed and the Proton signals are directly routed to the receivers, through a “bypass” path, without any loss.  It may be noted that the proton path (bypass) loss is very critical as it directly impacts the receive chain signal-to-noise (SNR) and the image quality.  In addition, the MNS module may also be configured to aid in frequency conversion of MNS loop-back signal for purposes of self-diagnosis. 

[0004]             Further, a hardware implementation to achieve MNS option functionality typically involves switching of RF paths to realize the desired options i.e., frequency conversion and/or bypass and loopback.  This switching is generally performed by discrete RF SPDT switches.  Unfortunately, use these switches results in undesirable levels of associated losses. 

[0005]             It may therefore be desirable to develop a robust technique and system for enabling switching that advantageously facilitates substantially superior performance of the imaging system.  In particular, there is a need for a system that may be configured to allow the bypass function with substantially low losses. 


[0006]             These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characte...