Jul 13, 2024 · Spins that are moving in the same direction as a magnetic field gradient develop a phase shift that is proportional to the velocity of the spins. This is the basis of phase-contrast angiography.

Jun 22, 2025 · Time-resolved 2D phase-contrast imaging with velocity encoding is the most widely used method and relies upon location-specific sequential application of a pair of phase encoding pulses in …

Jul 13, 2024 · Velocity encoding or Venc is referred to as an operator-controlled parameter for the determination of the maximum velocity within a velocity-encoded phase contrast imaging study.

Feb 4, 2025 · Contrast phases are terms used to describe different stages of contrast enhancement to blood vessels, following the introduction of a pressure-injected intravenous (IV) contrast agent such …

Aug 22, 2024 · These imaging techniques use additional 180º pulses to null signal from blood and other tissues, and, therefore, improve contrast. The most used sequence is STIR.

Nov 30, 2025 · Imaging data is acquired during the different phases of each cardiac cycle and allocated to the corresponding k-spaces. The data accretion process requires a few R-R intervals.

May 20, 2025 · However, if the FOV and matrix size (phase-encoding steps) are increased and simultaneously the number of excitations (or number of signal averages) is reduced to half, the …

Jun 28, 2024 · This article is a summary of emerging medical imaging technologies in development or in the early phase of clinical adoption. The methods are listed by modality.

Mar 29, 2025 · It is most commonly performed as a non-contrast study, but the addition of a contrast-enhanced phase is performed for some indications. This article covers non-contrast and delayed …

Oct 22, 2025 · Susceptibility weighted imaging (SWI) is an MRI sequence that is particularly sensitive to compounds which distort the local magnetic field and as such make it useful in detecting blood …