방사선사나라 Radiographer Nara

(영어/영문/English) Wrap around artifact? Anatomical structures outside the FOV appear inside the FOV, also called aliasing or fold over artifacts. These artifacts are generated when a FOV smaller than the size of the subject is selected and appear in either the frequency direction or the phase direction. (Also occurs in 3-D images) 1. Frequency wrap It occurs when the generated echo is under sampli..

(영어/영문/English) SENSE (=ASSET) ? SENSE uses phase array coil (= synerge coil, = multi coil) to replace sequential gradient switching with parallel sensitivity encoding by a sensitive receiver. The SENSE method acquires data by skipping the phase coding step like rFOV. In this case, aliasing artifacts are generated, and the SENSE technique acquires an image by separating the overlapped signal usi..

(영어/영문/English) RFOV (Rectangular Field of View) ? In general, the FOV of the MRI comes out as a square, while the RFOV creates an image in the form of a rectangle. This is a method of constructing an image by acquiring data while skipping step of a phase encoding gradient at some intervals. Although it is possible to shorten the scan time by reducing the total number of phase encoding, the SNR ..