PETRA is a combination of a radial zero-TE and single point imaging (SPI) acquisition, which is very silent and which can efficiently acquire MR signals with short T2*. In PETRA, the acquisition of SPI data constitutes a major part of the acquisition time especially for high-resolution protocols. To accelerate the SPI section while preserving the image quality, we combine SPI with compressed sensing (cs). csPETRA enables 3D imaging with isotropic sub-millimeter resolution within only a few minutes, e.g., for (0.5 mm)3 voxel-size with (20 cm)3 field-of-view, which is demonstrated with different acceleration factors for high-resolution imaging of the knee.
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