Chapter 1: Introduction To Medical Imaging

Question 1

Refers to imaging in which the energy source is outside the body on one side and energy passes therough the body and is detected on the other side of the study

Answer 1

Transmission Imaging

Question 2

Refers to the case when each point on the image corresponds to information along a straight line trajectory through the patient

Answer 2

Projection Imaging

Question 3

Refers to the continuous acquisition of sequence of xray images over time, essentially a real time xray movie of the patient

Transmission projection imaging

Answer 3

Fluoroscopy

Question 4

Mammography used to screen asymptomatic women for breast cancer

Answer 4

Screening mammography

Question 5

Used to aid in the diagnosis of women with breast symptoms such as presence of a lump

Answer 5

Diagnostic mammography

Question 6

Images are produced by passing xrays through the body at large number of angles, by rotating the xray tube around the body

Answer 6

CT scan

Question 7

This collects the transmission projection data in a CT scan. This is opposite to the xray source

Answer 7

Detector Array

Question 8

Voxels are analyzes for metabolic products in tissue

Answer 8

MR spectroscopy

Question 9

A short duration pulse of sound is generated by an ultrasound transducer that is in directphysical contact with the tissues being imaged.

Answer 9

Pulse echo imaging

Question 10

Ultrasound transducer which produces sector scanned area using incremental angles

Answer 10

Phase array multielement transducer

Question 11

Change in ultrasound frequencies

Answer 11

Doppler shift

Question 12

Branch of radiology in which a chemical or other substance containing a radioactive isotope is given to the patient orally, by injection or by inhalation.

Answer 12

Nuclear Medicine Imaging

Question 13

Nuclear medicine projection imaging, each point on the image is representative of the radioisotope activity along a line projected through the patient.

Answer 13

Nuclear Medicine planar imaging

Question 14

A nuclear camara records x or gamma ray emissions from the patient from a series of different angles around the patient

Answer 14

Single Photon Emission Computed Tomography

Question 15

Positively charged eletrons, emitted by some radioactive isotopes

Answer 15

Positron

Question 16

Energy emitted when the positron combines with the electron from the surrounding tissue, and the mass of both the e+ and e- is converted

Answer 16

Annihilation radiation

Question 17

Nuclear medicine which uses rings of detectors that surround the patient which identifies photon pairs undergoing annihilation

More sensitive that SPECT

Answer 17

Positron Emission Technology

Question 18

Image properties which manifects as differences in teh grascale values in the image

Answer 18

Contrast

Question 19

Image property which refers to the ability to see fine detail

Answer 19

Spatial resolution

Question 20

Highest resolution modality in radiology

Answer 20

Screen film mammography (0.03mm)

Followed by
Digital mammography (0.05-0.10mm)
Screen film radiology (0.08 mm)

Least
MRI 1.0mm