MRI

Magnetic Resonance Imaging (MRI) uses radio-frequency waves and a strong magnetic field rather than x-rays to provide remarkably clear and detailed 2-D and 3-D pictures of internal organs and tissues.

Description

Magnetic Resonance Imaging (MRI) is a non-invasive diagnostic technology that produces physiologic images based on the use of magnetic and radio frequency (RF) fields. The MRI system uses powerful magnets to create a magnetic field which forces hydrogen atoms in the body into a particular alignment (resonance). Radio frequency energy is then distributed over the patient, which is disrupted by body tissue. The disruptions correspond to varying return signals which, when processed, create the image.

The accurate processing of these signals is key to obtaining high quality images. A key system consideration for the receive channel is high SNR. The return signals have narrow bandwidths with an IF location directly dependent on the main magnet s strength. Some systems use high-speed pipeline ADCs with wideband amplifiers to directly sample the IF, leaving large headroom for post-processing gain by a digital down converter or FPGA. Other systems mix the IF to baseband where lower-speed, higher-resolution SAR and delta-sigma ADCs can be used.

For controlling the magnetic and RF energy in the MRI, high-resolution, high-speed DACs are needed. High resolution is required to accurately define the area of the patient to be scanned. High-speed is necessary to match the high IFs being generated by the main magnet. DSPs can be used to provide gradient processor control used for properly controlling the magnets in the MRI system. A DSP can also take care of preprocessing the signal before it reaches the image reconstruction engine.

A wide variety of TI products are available for MRI systems and equipment manufacturers, including op amps, DSPs, multi-channel high- and low-speed data converters, clocking distribution, interface, and power management.

TI products may not be used in life-critical medical equipment unless authorized officers of the parties have executed a special contract specifically governing such use. See our Terms of Sale for additional information.

Application notes & user guides

Application Notes (1)

Title Abstract Type Size (KB) Date Views
HTM 9 KB 08 Jun 2010 189

Selection & solution guides

Selection Guides (3)

Title Abstract Type Size (KB) Date Views
PDF 9.09 MB 02 May 2013 3703
PDF 3.34 MB 02 May 2013 2291
PDF 3 MB 10 Apr 2013 2291

Tools & Software

Name Part # Company Software/Tool Type
ADS5263 Evaluation Module ADS5263EVM Texas Instruments Evaluation Modules & Boards
ADS5294 Evaluation Module ADS5294EVM Texas Instruments Evaluation Modules & Boards

Product bulletin & white papers

Product Bulletin (1)

Title Abstract Type Size (MB) Date Views
PDF 515 KB 09 Nov 2012 361

White Papers (4)

Title Abstract Type Size (MB) Date Views
PDF 333 KB 08 Jun 2010 348
PDF 358 KB 18 Mar 2009 51
PDF 115 KB 03 Nov 2008 750
PDF 187 KB 31 Oct 2008 317

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