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4 PULSE SEQUENCES

FAST SPIN ECHO PULSE SEQUENCES

QuestionAnswer
Fast spin echo pulse sequences are also called? Rapid spin echo, Turbo spin Echo, or RARE
fast spin echo pulse sequence differ from standard pulse sequences in how: frequently the echoes are collected and where the echoes are placed in the raw data
A fast spin echo pulse sequence is faster than a conventional sequence, because more than one echo is collected during a single repetition for a single slice
The fast spin echo sequence requires less RF energy than a traditional spin echo sequence. However the fast repetition of 180° RF pulse in fast spin delivers a much greater amount of RF energy into the patient's body per time
The number of echoes collected in fast spin is called the:
Fast spin echoes are placed into raw data file in a particular order to generate an image In order to get desired image contrast
Information located at the periphery of the raw data is said to contain? High special frequencies, since this is where the amplitude of the phase encoding and read out gradients are greatest
The high spatial frequencies correspond to? The edge definition or spatial resolution of the resulting image
Information located toward the center of the raw data is said to contain? Low spatial frequencies, since this is where the amplitude of phase encoding and readout gradients are the lowest
Low spatial frequencies correspond to? The contrast of the resulting image
Determine the image contrast, and located in the center of the raw data file? Low spatial frequency
Determines the edges and find details of the image, that are located at the periphery of raw data file High spacial frequencies
Every echo contributes the entire image, but those towards the center of the raw data contribute more contrast information and those towards the periphery contribute more? Resolution information
Fast spin echo pulse sequences, organize their echoes such that the desired TE's are placed in the central lines of raw data Placing those echoes in the central raw data lines ensure the tissue exhibited in the final image is what we expect at the desired TE
Specified TE parameters such as 90 MS, replace the echo of the 90 in the center of raw data
Fast spin echo pulse sequences are most noted for reducing the scan times of_____ images. T2 weighted
Because of its relatively short scan time, fast spin echo pulse sequences can be used for most____? Clinical applications in all parts of the body
In a fast spin echo sequence many echoes may be collected during a single TR period. Also each recorded echo is not added in sequential order in the raw data each Echo collected is still uniquely phase encoded and placed in a single line of the raw data, but more echoes are collected per TR thus fewer repetitions are required to fill the remainder of the raw data
Every echo contributes the entire image but those towards the center of the raw data contribute more contrast information in those towards the periphery contribute more resolution information To better manage the contrast the echoes need to be re-ordered as they are placed into the raw data
Created by: tomvilla21
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