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Abstract #2444

Simple Method for Attenuation of Streaking Artifacts from Peripheral Intensity Accumulation

Kai Tobias Block1, Matthias Fenchel2

1Department of Radiology, NYU Langone Medical Center, New York, NY, United States; 2Siemens AG Healthcare Sector, Erlangen, Germany

Images acquired with radial k-space sampling frequently suffer from mild or severe streaking artifacts even if the Nyquist sampling requirements are fulfilled. Often, the streaking artifacts arise from high-intensity signal spots in the periphery of the field-of-view. This work describes a simple method to attenuate such long-distance streaks by constraining the image contributions from each coil element to only those areas where the element is known to have sufficient sensitivity. The method works fully automatic, does not affect the SNR or prolong the scan time, and achieved clear improvement of the image quality in volunteer studies.

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Keywords

acceptance accumulation addition appear applications applying arise arrays artifact artifacts attenuation automatic available benefit beyond binary brain calculating calibration cause caused cerebellum channel clear close coil coils combination combined compressed consent constraining context contribution corrected covered describes difficult discarded distance element elements elimination employed estimation example explained field free generation gradient guarantee happens idea identified illustrate improvement includes inclusion individual intensity interpolation invest known leads linearities local long loss many mapped mask masks mild multiplied neck normalization normalize object often orientation originate overlap particularly peaks peripheral pixels post prescribed prevent prevents problems procedure procedures processing profiles prolong proposed quality radial receive reception reconstruction reconstructions reduce reduced reduction rejection relevant remain require residual resolution routine sampled sampling sector segmentation sensing sensitivity severe significantly simple source space spatial spine spokes spot spurious squares streaking streaks strength studies support suppression surface system theory threshold thresholding towards uncombined uncorrected user validated view views visible written