specialtopics.txt

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Author:
radaardvark
ID:
85452
Filename:
specialtopics.txt
Updated:
2011-05-12 12:53:58
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Radiology
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Special Topics Rad Final
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  1. What are two main blood flow circuits in the body
    • 1. Systemic
    • 2. Pulmonary
  2. How does the blood flow through the heart
    right atrium-tricuspid valve-right ventricle-pulmonary artery-pulmonary veins-left atrium-mitral valve-left ventricle-aortic valve-ascending aorta
  3. How does the blood flow through the fetus
    placenta- umibilical veins- IVC- right atrium- foramen ovale- left atrium- left ventricle- SVC- right atrium- right ventricle- ductus arteriosus- systemic circulation- umibilical arteries- placenta
  4. How does cereberal spinal fluid circulate
    made in the choronid plexus in the lateral ventricles- third ventricle-fourth ventricle
  5. What is the cerebral circulation of blood flow
    • internal carotids bifurate into
    • 1) anterior cerebral arteries
    • 2) middle cerebral arteries
    • 3) ant./post. communicating arteries
    • vereterbals unite to form basiliar artery that bifurates into
    • posterior cerebral arteries
    • circle of willis
  6. What is an intrathecal injection
    injection into the subarachnoid space
  7. What are the coverings of the brain
    • 1) Dura Mater
    • 2) Arachniod Layer
    • 3) Pia Mater
  8. What is the conus medullaris
    the terminal end of the spinal cord, ending at L1-L2
  9. What is a look-up table
    compares density and luminscence values of image to those of previous exam
  10. What is automatic rescaling
    the process by which automatic readjustment of density and contrast is made to the image to align with previous exams
  11. What is an exposure number
    a number indicating the sensitivity of the image receptor to exposure, therefore, indicating over or under exposure during the exam
  12. PACS is what and what does it do
    • Picture Archiving and Communication System
    • a computer system that manages the electronic images
  13. DICOM stands for what and what does it do
    • Digital Imaging & Communication In Medicine
    • PACS standard for the exchange, display of and the storage of medical images and text
  14. CCD is what and what does it do
    • Charged Couple Device
    • converts light to analog electrical signal
  15. TFT stands for what and what does it do
    • Thin Film Transistors
    • electronic gates that allow for active read out
  16. Acoustic Impedance is what and why is it important in ultrasound
    • the ability to stop the ultrasound beam
    • without an acoustic impedance there is no image
  17. What are the different ways of weighing an image in MRI
    • 1) Proton Density
    • 2) T1 relaxation time
    • 3) T2 relaxation time
    • 4) Flow
  18. What does gating mean
    • A technique the reduce image motion & blur by constructing the image from the same point in a cycle of repeating motion
    • like the heart cycle
  19. What is a time-of-flight study
    a special pulsed sequence that suppresses the area under study (arteries). A signal is only obtained from the tissue outside the area of study. Thus, the incoming blood appears bright where tissue signal has been suppressed.
  20. What are the three phases of CT image formation
    • data acquistion
    • image reconstruction
    • image display
  21. What is fourier transformation and where is it used in the image formation process
    • a method to study waves with application of different equations in order to reconstruct an image
    • used in image reconstruction to evulate attenuation projections in order to mathematically reconstruct images
  22. What is interpolation and where is it used
    • mathematically method of creating missing data
    • assumes data between two known values

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