Biomedical Engineering Reference
In-Depth Information
Tissue with different compositions will have an altered time to return back to normal condi-
tions and therefore, pathological conditions (such as cancer) can be identified from this
technique.
15.4
in vivo
Angiography or arteriography is a technique to visualize blood vessels
. Digital
subtraction angiography (DSA) is most commonly used because it can subtract the sur-
rounding tissues and bones, leaving only the vessels filled with the dye visible. There are
many much simpler methods that can be used to conduct
in vivo
studies and collect infor-
mation on blood or other biofluids.
HOMEWORK PROBLEMS
15.1
Discuss some of the difficulties that may be encountered when conducting live animal
preparations. Are there any ways to minimize these difficulties? Are these new methods
associated with their own difficulties?
15.2
An ultrasound probe is being used to image a blood vessel. The probe is emitting a sound
wave at a frequency of 2 MHz. Calculate the Doppler frequency if the angle between the
blood vessel and the incident wave is 65
and blood is flowing at 50 mm/sec.
15.3
The magnetic ratio being used in a magnetic resonance imaging system is 42.5 MHz/T.
Determine the orbital frequency for an electron within a 2T magnetic field. How can we
enhance the imaging with this machine?
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