Calculate the read gradient strength used in mT/m

MRES7100 Assignment 2 Semester 1 2018

Assignment 2 will be marked out of 20 as below, and then scaled to 16. Q1. (10 marks) Examine the images A and B acquired at 7T below. For each image, discuss the origin of the contrast observed in the CSF, white matter (WM) and grey matter (GM). As part of your answer:

a. state the type of weightings in each image and give brief reasoning (4 marks) b. suggest a sequence that could produce this weighting for each image ( 2 marks) c. suggest possible range of TE, TR, and TI (if appropriate) values that might

produce these images given the following properties: • average T1 at 7T: CSF 4sec, WM 1.4sec and GM 2sec • approx. T2: CSF 500ms, WM 40ms and GM 50ms (4 marks)

A B

Q2. (10 marks) Image B above was acquired with the following acquisition parameters: FOV 23cm x 23cm, receiver BW 78,080Hz, pixel size 0.72mm x 0.72mm.

a. Draw a representative sequence diagram for this pulse sequence. (5 marks) (Do not copy and paste a graphic from a text or the web – draw by freehand if necessary and insert a scan or photograph.) Include:

• All necessary RF pulses • All gradient pulses • Echo signals • Indicate TR and TE and other critical parameters if appropriate • Label each line of the sequence

b. Calculate the dwell time for the acquisition (1 mark) c. Calculate the read gradient strength used in mT/m (3 marks) d. Calculate the image matrix size (1 mark)

find the cost of your paper

Strawberries

global warming

. What are the most important contributions by Galileo in the history of physics? Why do you think so? How do these contributions affect your life? Your journal entry must….

characteristics of the fourth state of matter: plasma.

. What are the most important contributions by Galileo in the history of physics? Why do you think so? How do these contributions affect your life? Your journal entry must….

law of motion

. What are the most important contributions by Galileo in the history of physics? Why do you think so? How do these contributions affect your life? Your journal entry must….