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 …

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 …

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 …

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 …

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.

May 20, 2025 · Within a given bandwidth, higher frequency signals come from the periphery of the image and are aliased over the lower frequency (relatively) central portion of the image. …

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 …

Jul 23, 2025 · Hepatobiliary MRI contrast agents are specialized contrast agents used to aid diagnosis in MRI. They are separated into three categories: gadolinium-based agents, …

Mar 23, 2023 · The excretory phase also known as the urographic phase is a postcontrast injection time range in which there is an optimal enhancement of the renal collecting systems.