Bioimaging Exam II Review

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Biomedical Engineering

University/Undergrad

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11 Terms

1
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MRI vs Ultrasound

* Image Bone
* Better resolution


* Portable
* Realtime & Fast


* Tomographic
* Functional imaging
MRI

* Image Bone
* Better resolution

Ultrasound

* Portable
* Realtime & Fast

Both

* Tomographic
* Functional imaging
2
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MRI/Ultrasound vs Xray
Non-ionizing, functional, tomographic
3
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T or F: Acoustic linear attenuation coefficient is a function of frequency
True
4
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T or F: Ultrasounds use lower frequency to image deeper within tissue

\
(Think: attenuation increases with frequency)
True
5
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As you increase the B1 field, that’s the RF pusle that affects the ________ of movement, but B1 must still be at Larmor Frequency to create resonance
Angle
6
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The Larmor Frequency is dependent on the B__
0
7
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T or F: MRI’s are recorded in the transverse plane
True
8
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Helium is used in MRI to…
Cool the coil to lower resistence (preserve energy)
9
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The frequency range of the waves used in MRI are in the _____Hz range
M
10
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B1 is turned ____ before we record the signal -- it’s needed to excite, but turns off so it can relax and be measured.
Off
11
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