✦ LIBER ✦

Echo-planar high-resolution flow velocity mapping

✍ Scribed by D. N. Firmin; R. H. Klipstein; G. L. Hounsfield; M. P. Paley; D. B. Longmore

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 598 KB
Volume: 12
Category: Article
ISSN: 0740-3194
DOI: 10.1002/mrm.1910120304

No coin nor oath required. For personal study only.

✦ Synopsis

A technique for the very rapid measurement of blood flow with high spatial resolution is described. The method combines the previously validated technique of phase velocity mapping and echo-planar principles. The relatively small diameter of blood vessels enables a high-resolution echo-planar flow measurement to be made with as few as 16 echoes such that the method can be incorporated into a near standard NMR scanner. Two sequence variations are tested and validated in vitro and one is used to demonstrate in vivo blood flow measurement. The results are shown to compare well with a previously validated less rapid method. The technique should enhance the potential of NMR flow imaging by enabling sudden changes in flow to be studied. It should also simplify the measurement of blood flow in small mobile vessels such as the coronary arteries. o 1989 Academic Press, Inc.

📜 SIMILAR VOLUMES

Exercise-related changes in aortic flow

✍ Raad H. Mohiaddin; Peter D. Gatehouse; David N. Firmin 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 547 KB

## Abstract Spiral echo‐planar magnetic resonance (MR) velocity mapping was used to measure exercise‐related changes in flow in the descending thoracic aorta in 10 healthy volunteers. Flow was measured at rest and Immediately after dynamic exercise, with a 0.5‐T imager with a surface receiving coil

Resolution in High Field Echo Planar Mic

Resolution in High Field Echo Planar Microscopy

✍ A.M. Peters; R. Bowtell 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 883 KB

The application of echo planar imaging to NMR microscopy offers a temporal resolution unparalleled by other techniques. However, a major difficulty in imaging at the high field strengths used for microscopy is the effect of local field inhomogeneities caused by magnetic susceptibility effects. This

Fast high-resolution 3D segmented echo p

Fast high-resolution 3D segmented echo planar imaging for dose mapping using a superheated emulsion chamber

✍ Michael Lamba; Scott K. Holland; Vincent Schmithorst; Bernard Dardzinski; France 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 351 KB

## Abstract The superheated emulsion chamber (SEC) consists of superheated droplets of halocarbons in an aqueous gel. The gel resides in a pressure chamber. Brachytherapy sources can be implanted in the SEC for radiation dosimetry studies. Upon irradiation by ionizing radiation, the metastable drop

Plow quantitation with echo-planar phase

Plow quantitation with echo-planar phase-contrast velocity mapping: In vitro and in vivo evaluation

✍ Jorg F. Debatin; Daniel A. Leung; Simon Wildermuth; Rene Botnar; Jacques Felblin 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 749 KB

## Abstract We present a multishot echo‐planar imaging (EPI) phase‐contrast implementation for flow quantitation. The measurement accuracy of this technique was evaluated in vitro and in vivo. A gated eight‐shot EPI phase‐contrast sequence (TR/TE = 16/7.4, 45° flip angle), with a flow‐phase interva

High-resolution echo-planar fMRI of huma

High-resolution echo-planar fMRI of human visual cortex at 3.0 tesla

✍ Keith R. Thulborn; Sam Y. Chang; Gary X. Shen; James T. Voyvodic 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 226 KB 👁 2 views

Known specialized properties of the human visual cortex have been used to investigate the role of spatial resolution on fMRI using blood oxygenation level dependent (BOLD) echo-planar MRI at 3.0 tesla. The magnitude of BOLD signal changes has been examined at low (3.1ϫ 3.1ϫ 3.0 mm 3 ) and high (0.8ϫ

High-resolution blood flow velocity meas

High-resolution blood flow velocity measurements in the human finger

✍ M. Klarhöfer; B. Csapo; Cs. Balassy; J.C. Szeles; E. Moser 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 173 KB

## Abstract MR phase contrast blood flow velocity measurements in the human index finger were performed with triggered, nontriggered, and cine acquisition schemes. A strong (__G__~__max__~ = 200 mT/m), small bore (inner diameter 12 cm) gradient system inserted in a whole body 3 Tesla MR scanner all