Results 251 to 260 of about 197,943 (293)

Spin-echo versus gradient-echo fMRI with short echo times

Magnetic Resonance Imaging, 2001
Blood-oxygen level dependent signal changes in the visual cortex were investigated as a function of echo time with spin-echo and gradient-echo EPI at 1.5 T and 3 T. The linear relationship between the fractional signal change and the echo time was apparent in all cases.
Stroman, P., Krause, V., Frankenstein, U., Malisza, K., Tomanek, B.   +4 more
openaire   +3 more sources

Fast Spin Echo STIR Imaging

Journal of Computer Assisted Tomography, 1994
Our goal was to evaluate the image quality, contrast characteristics, and possible clinical utility of STIR images obtained using a fast SE (FSE) technique.The signal and contrast characteristics of FSE STIR images were evaluated using a lipid/water phantom and normal volunteers. Based upon these results, optimal FSE STIR imaging parameters were chosen.
R C, Smith, R T, Constable, C, Reinhold, T, McCauley, R C, Lange, S, McCarthy   +5 more
openaire   +2 more sources

Spin Echoes after ArbitraryNPulses

Journal of Magnetic Resonance, 1997
Based on the Bloch equations, the general response of a nuclear spin-½ system to multiple RF pulses with arbitrary phases and flip angles is presented. The general solution is expressed in a form including the pathway vectors specifying the magnetization paths generated by a string of pulses.
, Kim, , Lee
openaire   +2 more sources

Multiecho, spin‐echo sequence to eliminate unwanted echoes

Magnetic Resonance in Medicine, 1991
AbstractTwo types of artifacts—a mirror‐reversed image about the phase‐encode direction and a wave‐like intensity variation across the image—may appear when using a conventional multiecho spin‐echo sequence. We describe and demonstrate a new method, which eliminates such artifacts, using only one excitation per phase‐encoding step and without the need ...
Y, Zur, X, Zou, L J, Neuringer
openaire   +2 more sources

Radial turbo spin echo imaging

Magnetic Resonance in Medicine, 1994
AbstractFast MR imaging methods should provide a familiar contrast behavior at a reduced scan time. The multi‐spin echo approach (TSE) is one of the most promising techniques satisfying this condition. Although the data acquisition time is significantly reduced, image quality may still suffer from artifacts due to patient motion and flow.
V, Rasche, D, Holz, W, Schepper
openaire   +2 more sources

Spin Echo Spectroscopy—Spin Refocusing

2017
As is shown in the previous chapter the spin ensemble can be partially excited and saturated by applying a strong microwave driving field.
openaire   +1 more source

Plasma Echo and Spin Echo Holophones

Nature, 1971
A collisionless plasma, or an assembly of nuclear or electron spins in a magnetic field, can function as a holophone which can record a temporal sequence of electrical signals and subsequently play them back when supplied with a cue sequence, consisting of a small part of the recorded sequence.
openaire   +1 more source

Spin Echo Apparatus

Review of Scientific Instruments, 1957
A spin echo apparatus is described which can measure nuclear relaxation effects for narrow resonances, convection and diffusion effects, and in some cases, chemical splittings in liquids. This apparatus is assembled mostly from commercial equipment. Commercial units used are identified, and circuit diagrams are given for specially constructed apparatus.
openaire   +1 more source

Quantum guidelines for solid-state spin defects

Nature Reviews Materials, 2021
Gary Wolfowicz, F Joseph Heremans, Christopher P Anderson   +2 more
exaly  

Spin Echos

2001
M. Mehring, V.A. Weberruß
openaire   +1 more source