NMR signal

NMR signal

A term defined in MRI as the electromagnetic signal in the radio-frequency range produced by the precession (gyrations) of the transverse magnetisation of the spins, the rotation of which induces voltage in a receiving antenna (coil) which is amplified and demodulated by the receiver circuits.
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For detection protons which give the strongest NMR signal in nature, the ultrafast sample spinning rate is the key factor for narrowing of spectral lines and achieving high spectral resolution.
60 ]samples from 50 Kelvin (minus 223 degrees Celsius) to 5 K (minus 268 degrees Celsius) and then monitored their NMR signal every few minutes over several days.
Using proprietary software customized for use with NMR technology, the amplitude or "volume" of the NMR signal is directly proportional to the concentration of the particle subclass of lipoprotein particles emitting the signal.
13]C NMR signal intensity in the aryl and O-aryl regions of the acquired spectra were used to estimate the proportion of OC present in the fractions that should be allocated to the ROC fraction.
This approach relies on the fact that the NMR signal from the terminal methyl groups of a variety of lipoprotein constituents is proportional to the particle count for a given lipoprotein class.
Swelling of the coating upon water ingress was estimated by measurement of film length and by an increase in NMR signal intensity as water molecules occupied more free volume.
Percentage of total NMR signal assigned to each carbon-type Determined from spectra acquired on 200 MHz spectrometer (200) and 400 MHz spectrometer (400) Sample Carboxyl Aryl O-alkyl Alkyl 200 400 200 400 200 400 200 400 1 8.
3]He will produce a large NMR signal so a precise relative determination of d[P.
Moreover, the NMR signal indicating an organosilicon compound is weak, he says.
His seminal discoveries of the variations in soft body tissue relaxation times, as well as the cancer detecting NMR signal, are the means used by all MRI scanners to detect cancer and distinguish healthy versus diseased tissues.
The decaying signal, called the free induction decay (FID), is collected as a function of time and yields the NMR signal for the sample.
Hyperpolarization boosts the detectable NMR signal of the contrast agents by up to 4 orders magnitude and the generation of singlet states conserves the enhanced polarization for a long time, while not giving a directly detectable signal.