AIM: Ch 1: Introduction Flashcards
It was the first medical imaging technology made possible
Radiography
Who discovered radiography? When was radiography discovered?
Wilhelm Roentgen
November 8, 1895
It refers to imaging in which the energy source is outside the body on one side, and the energy passes through the body and is detected on the other side of the body.
Transmission imaging
It refers to the case when each point on the image corresponds to information along a straightline trajectory through the patient.
Projection imaging
T/F: Radiography is both a transmission and projection imaging
True
It refers to the continuous acquisition of a sequence of x-ray images over time, essentially a real-time x-ray movie of the patient.
Fluoroscopy
It is the radiography of the breast, and is thus a transmission projection type of imaging.
Mammography
Some digital mammography systems are now capable of tomosynthesis, whereby the x-ray tube (and in some cases the detector) moves in an arc from approximately ____ around the breast
7 to 40 degrees
Give 2 radioactive isotopes that produce positrons
F-18, O-15
What do you call the energy that is emitted when the positron (e) combines with an electron (e) from the surrounding tissue, and the mass of both the e and the e is converted by annihilation into pure energy, following Einstein’s famous equation E = mc2?
Annihilation radiation
It is the most common radiographic procedure performed in the world.
Chest radiograph
These tissues have a higher proportion of protons than other tissues, due to the high concentration of hydrogen (CH3(CH2)nCOOH).
Adipose tissues
It refers to the ability to see small detail.
Spatial resolution
It is the size of the smallest object that an imaging system can resolve.
Limiting spatial resolution
T/F: The wavelength of the energy used to probe the object is a fundamental limitation of the spatial resolution of an imaging modality.
True
