Advanced metal artifact reduction MRI of metal-on-metal hip resurfacing arthroplasty implants: compressed sensing acceleration enables the time-neutral use of SEMAC

Abstract

Compressed sensing acceleration enables the time-neutral use of SEMAC for MRI of metal-on-metal hip resurfacing implants when compared to high-BW TSE and image quality similar to conventional SEMAC.

Instrument visualization using conventional and compressed sensing SEMAC for interventional MRI at 3T

“…This resulted in a 55% reduction of the length of time needed for data acquisition, while yielding similar image quality when compared to fully sampled SEMAC images. Similar shortening of data acquisition was achieved in hip and knee arthroplasty implants without measurable differences in image quality compared to fully sampled SEMAC images . In a study evaluating multispectral imaging of spinal implants, CS‐based data sampling reduced the acquisition time by 40–50% from 4–8 min down to 2–5 min while maintaining similar image quality to fully sampled datasets …”

“…First, the size of the needle artifacts was measured in the in‐plane direction, but not in the through‐plane direction due to the anisotropic nature of the acquired data. The effect of decreasing signal displacement in the through‐plane direction has been demonstrated before and is ultimately reflected indirectly in decreasing metal artifacts that are measured in‐plane . Second, the SNR and CNR were measured in a pork phantom at room temperature and may differ from human tissue in a clinical setting.…”

“…Similar shortening of data acquisition was achieved in hip and knee arthroplasty implants without measurable differences in image quality compared to fully sampled SEMAC images. 20,21 In a study evaluating multispectral imaging of spinal implants, CS-based data sampling reduced the acquisition time by 40-50% from 4-8 min down to 2-5 min while maintaining similar image quality to fully sampled datasets. 38 Another technique that combines accelerated data acquisition and metal artifact-reducing capabilities is 2D multispectral imaging.…”

“…However, a major obstacle for the procedural use of SEMAC in interventional MRI is the long acquisition time, which is associated with the number of spectral phase encoding steps. The time of SEMAC data acquisition can be shortened with incoherent undersampling of k ‐space and subsequent compressed sensing (CS) reconstruction, which has been successfully applied for MRI of joints with metallic implants . The combination of reduced acquisition time and the potential for more accurate needle visualization may render CS‐SEMAC beneficial for procedure guidance at 3T.…”

“…The time of SEMAC data acquisition can be shortened with incoherent undersampling of k-space and subsequent compressed sensing (CS) reconstruction, which has been successfully applied for MRI of joints with metallic implants. 20,21 The combination of reduced acquisition time and the potential for more accurate needle visualization may render CS-SEMAC beneficial for procedure guidance at 3T.…”