MRI Physics #16 - Radiology Physics Course - Gradient Echo MRI bili_21686626238 0 0 MRI Physics #18 - Radiology Physics Course - Coherent, Incoherent 'Spoiled' and bili_21686626238 0 0 MRI Physics #8 - Radiology Physics Course - Frequency Encoding Gradient _ MRI Si bili_21686626238 0 0 ...
phase- or frequency-encoding is optimal. Trial and error may be necessary. I have been pleasantly surprised on numerous occasions that by simply swapping phase- and frequency-encoding directions empirically, very severe susceptibility artifacts may be reduced or moved away from from the area of ...
Single-sided MRI apparatuses, systems, and methods are disclosed. A method can include transmitting a frequency sweep excitation pulse comprising a low-to-high frequency sweep; phase encoding during the frequency sweep excitation pulse; and tuning the amount of phase accumulated during the frequency ...
'Phase encoding' 1 Reply] Category: General Phase encoding Hello, Could someone explain me simply the principle ofphase encoding? I don't understand the principle of applying higher gradient at each step. Thanks ! View the whole threadReply to this thread ...
METHOD AND MATERIALS Currently, the fastest imaging method for extended FOV is the continuously-moving-table (CMT) imaging. However, it is limited in that the directions of phase-encoding and table motion should not be parallel. Because of this, when homogeneous space is compressed in the table...
(PC-MRI) allows for a flow sampling period of about 50ms. To overcome this limitation, which makes MRI not able to acquire the high-frequency band of the flow wave, some more complex machinery is necessary, making this technology really expensive and not so simple for use in...
An MRI apparatus comprises a magnet system producing a homogeneous magnetic field along the z axis. A plurality of wire conductors arranged in a bird cage configuration are supplied with a circularly rotating RF field centered near the Larmor frequency &ohgr;. sub.o. The wire conductors receive...
Spectroscopic imaging of a sample placed outside of both the radio frequency and the imaging gradient coils is presented. The sample is placed in a field with a permanent one-dimensional inhomogeneity. The imaging gradients used for phase encoding are designed to produce a static field that depend...
A method is presented to correct for the imperfections of spatial encoding gradients in MRI. The approach is simple and fast, can be performed with standar... JH Duyn,Y Yang,JA Frank,... - 《Journal of Magnetic Resonance》 被引量: 575发表: 1998年 A homogeneity correction method for magn...
Several straightforward methods to reduce or eliminate phase wrap-around were discussed in theprior Q&A. These include: 1) increasing the FOV; 2) swapping phase- and frequency-axes; 3) using surface coils; and 4) applying saturation bands. ...