# Draw a pulse program diagram for a basic spin echo pulse sequence, showing all RF pulses, gradients, acquisition of the echo, TR and TE

Q1: Answer the following questions (Approximately half a page)

a. What is a magnetic field gradient?
b. How is the magnetic field gradient used to achieve frequency encoding of the echo?

Q2: Answer the following questions (Approximately half a page)

a. Describe the Nyquist theorem
b. Calculate the dwell time for a bandwidth of 180,000Hz (+/- 90,000 Hz)
c. Calculate the acquisition time of an echo using the dwell time from above for an image matrix of 200×128.
d. Calculate the gradient strength (mT/m) required at for this experiment if the FOV = 25cm. (Hint: γ/2π = 42.57 MHz/T)

Q3:Answer the following questions (Approximately 3 pages including pulse sequence diagram)

a. Draw a pulse program diagram for a basic spin echo pulse sequence, showing all RF pulses, gradients, acquisition of the echo, TR and TE. Do not copy and paste a picture from the web or a book.
b. Describe how images with proton density, T1 and T2 contrast are acquired with spin echo pulse sequences with respect to TE and TR.
c. Give two examples of how we can make better use of the TR time period with the spin echo pulse sequence. Briefly explain each.

Q4:Answer the following questions (Approximately 2 pages including pulse sequence diagram)

a. Draw a pulse diagram for a gradient echo pulse sequence showing all RF pulses, gradients, acquisition of the echo, TR and TE. Do not copy and paste a picture from the web or a book.
b. Describe how proton density (PD), T1, T2* and T1+T2 contrast are acquired with a gradient echo based imaging sequence in terms of a-pulse, TE, TR and any other additional gradients.

## How to place an order?

Take a few steps to place an order on our site:

• Fill out the form and state the deadline.
• Calculate the price of your order and pay for it with your credit card.
• When the order is placed, we select a suitable writer to complete it based on your requirements.
• Stay in contact with the writer and discuss vital details of research.
• Download a preview of the research paper. Satisfied with the outcome? Press “Approve.”

### Feel secure when using our service

It's important for every customer to feel safe. Thus, at College Papers Help, we take care of your security.

Financial security You can safely pay for your order using secure payment systems.
Personal security Any personal information about our customers is private. No other person can get access to it.
Academic security To deliver no-plagiarism samples, we use a specially-designed software to check every finished paper.
Web security This website is protected from illegal breaks. We constantly update our privacy management.

Get assistance with placing your order. Clarify any questions about our services. Contact our support team. They are available 24\7.

Still thinking about where to hire experienced authors and how to boost your grades? Place your order on our website and get help with any paper you need. We’ll meet your expectations.