Intro to Imaging Flashcards
X-rays
electromagnetic pocket of energy with an extremely short wavelength between 0.1 and 10 nanometres
Electrons inner shell
Confers electrical and chemical properties of the atom
Electrons Outer shell
Concerned with the production of X-rays
Intensity of an X-ray depends on the…
Tube current, atomic number of target, tube voltage
Attenuation
Process by which radiation loses power as it travels through matter and interacts with it
Attenuation increases with…
Z (atomic number), Density, Thickness of matter
Ultrasound
Machine transmits high frequency waves.
Waves travel into your body and hit boundary between tissues.
Some of the waves get reflected back to the probe, while some travel further until they reach another boundary and get reflected
Ultrasound picked up
Reflected waves are picked up by the probes and relayed to the machine.
Ultrasound Machine generates the distance from the probe to the tissue or organ using…
speed of sound of tissue and the time of each echos return
Barium Studies
A radio-opague contrast agent used for outlining the GI tract
The high atomic number of Barium allows for..
Barium to absorb more x-ray photons than surround tissues
Barium studies done in the…
oesophagus, stomach, duodenum
Computed Tomography
Rotating X-ray tube, multiple beams
Digital Geometry
Very good at defining bony detail
Radiation
Process of emitting energy in the form of either particles or waves
Ionising Radiation
A particle or wave with sufficient energy to ‘ionise’ a neutral atom or molecule, and leave them with either a charge which is positive or negative
