Lecture 5 - Intro to Cross-sectional Imaging Flashcards
In an X-ray, the electrons are thermoionically emitted from the _____ to the _____. When the beam is partially scattered with absorption, but not when it is purely scattered, there is some loss of _____. Keep in mind X-ray images are created by ______ the beam, so denser material will produce more intense image.
Cathode
Anode
Energy
Blocking
______ is real-time X-ray imaging, and it produces a less clear image than plain film. It is carried out with multiple bursts of low-dose beams as opposed to a continuous beam. Keep in mind dense material appears _____ in this type of image, which is the opposite of plain film.
Fluoroscopy
Dark
_____ medicine utilizes radiopharmaceuticals to create an image. The patient emits radiation that is detected by a sensor. This can be used therapeutically as well. Keep in mind the radiopharmaceutical agent can be manipulated to target specific tissue to determine ______ rather than structure.
Nuclear medicine
Function
Color can be assigned to ultrasound images, and it is typically used to observe _____ (like in arteries and veins). Keep in mind before color is assigned, fluids appear black. One of the big benefits of ultrasound is that it accurately depicts ______.
Flow
Dimensions
______ transmission describes how ultrasound waves pick up speed as they move through fluid, so images behind the fluid will appear brighter.
Thru transmission
MRI is used to view BOTH _____ and _____. The difference in MRI appearance of structures in the body depends on their magnetism, or the rates at which the atoms relax after a particular radiofrequency pulse is supplied –> this is called _______.
Structure and Function
Sequence
In T1 weighted MRI images, fluid and bone appear _____, muscle appears ______, and fat appears _____.
In T2 weighted images, Fluid and fat appear ____.
Dark (black)
Grey
White
White
