MRgRT

MRgRT

Professional Development

8 Qs

quiz-placeholder

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MRgRT

MRgRT

Assessment

Quiz

Physics

Professional Development

Practice Problem

Medium

Created by

Chanida Sathitwatthanawirot

Used 3+ times

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8 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is the main benefit of an MRI as compared to a CT?

It provides a better estimate of the Hounfield numbers.

It provides better contrast between soft-tissue structures

It is geometrically robust compared to CT

2.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The electron return effect...

..cannot be compensated in treatment planning


..only happens at 1.5T and higher field strengths


.is most prominent at tissue-air and tissue-lung-tissue interfaces

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

cine-MRI based beam gating...

..can facilitate smaller margins

..requires implantation of fiducial markers in or near the tumor

..is poorly tolerated by the majority of patients

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which one is CORRECT about MR-Linac?

SAD 143.5 cm

The immobilized devices should made from carbon fiber.

maximum field size 40x40cm2

Only VMAT available

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the sources of distortion in MRI?

Main magnetic field

patient

gradient non-linearity

All of above

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following fields should be considered in MRI safety assessment?

The main magnetic field and the gradient field

The radio frequency field

All of the above

7.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which one is CORRECT about Motion Monitoring (MM) in MR-Linac

3D Cine

balanced steady-state free precession

Real-time MRI guidance causes more harm to the surrounding tissues during treatment

image contrast is T2w

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