방사선사나라 Radiographer Nara

(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) POMP? It is an abbreviation of Phase Offset Multi Planar, and it is a method of acquiring signals by exciting two slices at the same time with a single complex RF pulse to obtain images as many as twice the number of slices at the same scan time. The FOV and the number of phase edcoding are doubled, and the raw data of the two images are positioned in the K-space to have respecti..

(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 ..

(영어/영문/English) 1. Partial Fourier Phase Encoding (Fractional NEX) This refers to a method of filling only about half of the K-space (approximately 50 to 75%) with the actual scan data in the phase coding direction and filling the rest of the mirror data with symmetric data, and is called the Partial Fourier Phase Encoding or Fractional NEX. The scan time can be reduced to about half while the s..

(영어/영문/English) EPI? It is an abbreviation of Echo Planar Imaging, and it is a method of measuring all of the phase encoding steps during one TR for making a image. It is the fastest imaging method among currently used sequences. (T1 image cannot be obtained because there is only one TR.) In all EPI methods, artifacts due to the chemical shift of water and fat signals are generated in the phase ..

(영어/영문/English) Fast Gradient Echo pulse sequence? FSPGR, FGRASS and Turbo-FLASH are pulse sequences that can acquire a fast image using TR and TE which are shorter than the conventional gradient field echo. (Varies by equipment company) Methods used to reduce TR and TE 1. factional RF By applying a fractional RF pulse to the extent that the spins can be excited, the time of RF pulse applied to ..

(영어/영문/English) SSFSE stands for Single Shot Fast Spin Echo, and HASTE stands for Half Fourier Acquisition Single Shot Turbo Spin Echo. It is a method of using multiple ETLs such as FSE and using a method of half fourier acquisition to obtain an image. Since 64~128 echo is obtained during one TR, and only half of the K-space is acquired to make an image, the image can be obtained in 1~2 seconds...

(영어/영문/English) Classic spin echo (SE) method? you can get one echo per TR. In the end, you can get an image only by receiving one echo for every TR and filling the K-space with the number of phase encoding steps. Scan time = TR x Phase encoding x NEX TR affects contrast, Phase encoding affects resolution, and NEX affects SNR. Multi echo (ME) method? Multiple signals are obtained by applying mul..

(영어/영문/English) Inverse recovery (IR) pulse sequence? (180º-90º-180º, 3 RF) This is a method to obtain the image by applying the 90º RF pulse and the 180º RF pulse after inverting the longitudinal magnetization from the Z-axis direction to the -Z-axis direction by first applying the 180º RF pulse. TI(Inverse Time) is the time from the 180º RF pulse to the 90º RF pulse. Because it is possible to ..

(영어/영문/English) The concept of 3D in MR imaging refers to a method of acquiring images. In the 3-dimension method, RF pulses are applied to the entire volume to be imaged to determine location information and measure the signal. A 3D technique is possible by adding a slice encoding gradient in the direction of the slice selection gradient to the 2D method. The slice encoding gradient also change..