Chapter 12 Flashcards
What signal intensity is an area of abnormality likely to have on a trace image
Hyperintense
Chemical shift is measured in which of the following units?
ppm
Functional imaging techniques allow MRI to be used to assess function and physiology as opposed to merely conventional structural imaging. (T or F)
true
T2 shine through occurs when lesions or areas with a very long T1 decay time remain bright on the DW or trace image. (T or F)
false
T2 shine through occurs when lesions or areas with a very long <strong>T2</strong> decay time remain bright on the DW or trace image
What signal intensity is an area of abnormality likely to have on an ADC map?
Hypointense
What term is used to describe the net displacement of diffusion spins across a tissue?
ADC
The anatomy of white matter tracts can be mapped using strong multi-directional gradients in which of the following?
diffusion tensor imaging (DTI)
MR microscopy (MRM) is useful as a research tool when studying detail in a very small area of tissue. (T or F)
True
Perfusion is measured using MRI by tagging the fat in arterial blood during image acquisition (T or F)
False
Perfusion is measured using MRI by tagging the WATER in arterial blood during image acquisition.
What is the extrinsic parameter that controls the amount of diffusion seen in an image?
b factor
What does BOLD stand for?
Blood oxygenation level dependent
Perfusion is the regional blood flow in tissues and is defined as the volume of blood that flows into one gram of tissue (T or F)
True
Functional imaging techniques include
Perfusion imaging
DWI
Spectroscopy
Which of the following best describes a use for MR Spectroscopy (MRS)?
To aid in brain tumor staging
Interventional MRI includes performing biopsies in the MR suite. (T or F)
True
Which type of technique is useful in stroke and tumor staging and may have use in understanding depression, epilepsy and schizophrenia?
MR Spectroscopy
TRUE or FALSE: Interventional MRI is very expensive, as all surgical, anesthetic and monitoring equipment must be nonferrous and MRI-safe.
True
What are typical b-values?
500 s/mm^2 - 1500 s/mm^2
TRUE or FALSE: I should be able to recognize a picture of a DWI vs a pic of an ADC and know how restricted diffusion looks on both.
True
occurs when lesions with very long T2 decay time remain bright on the DWI or trace image.
T2 shine through
Which are considered functional imaging techniques
whole body imaging spectroscopy MR microscopy perfusion imaging diffusion weighted imaging
Which value controls the amount of diffusion seen on the image?
B-value
ablation
uses heat
cryotherapy
uses extreme cold
