The flashcards below were created by user
radaardvark
on FreezingBlue Flashcards.
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What are two main blood flow circuits in the body
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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
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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
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How does cereberal spinal fluid circulate
made in the choronid plexus in the lateral ventricles- third ventricle-fourth ventricle
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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
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What is an intrathecal injection
injection into the subarachnoid space
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What are the coverings of the brain
- 1) Dura Mater
- 2) Arachniod Layer
- 3) Pia Mater
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What is the conus medullaris
the terminal end of the spinal cord, ending at L1-L2
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What is a look-up table
compares density and luminscence values of image to those of previous exam
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What is automatic rescaling
the process by which automatic readjustment of density and contrast is made to the image to align with previous exams
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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
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PACS is what and what does it do
- Picture Archiving and Communication System
- a computer system that manages the electronic images
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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
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CCD is what and what does it do
- Charged Couple Device
- converts light to analog electrical signal
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TFT stands for what and what does it do
- Thin Film Transistors
- electronic gates that allow for active read out
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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
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What are the different ways of weighing an image in MRI
- 1) Proton Density
- 2) T1 relaxation time
- 3) T2 relaxation time
- 4) Flow
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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
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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.
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What are the three phases of CT image formation
- data acquistion
- image reconstruction
- image display
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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
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What is interpolation and where is it used
- mathematically method of creating missing data
- assumes data between two known values
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