RADT 1010 PRACTICE Exam Questions/Answers 2025 GUARANTEE A+
Types of medical imaging - Structural (anatomy) and functional (physiology)
Structural - X-ray and non x-ray based based (ex. radiography or ultrasound )
Functional - Radioisotope based
Geometric relationships - - Object pralell to IR
- Object and IR perpendicular to CR
- Object as close to IR as possible
geometric factors of unsharpness - SID (bigger sid = better), OID (smaller oid better), Focal spot size
(bigger focal spot = more penumbra)
3 types of movement - Voluntary, involuntary (breathing), equipment
what is scatter? - radiation that has interacted with an attenuator and has changed direction and lost
some of its energy
Exposure factors - kV = tube voltage, mA = tube current, time = length of exposure, distance = SID
kV controls... - the number of xrays produced and the energy of the rays (potential difference between
the anode and cathode)
mA... - controls the number of xrays produced (DSL); current causes thermionic emission (# of x-rays
boiled off)
time... - controls the length of time that radiation is produced, controls the number of xrays produced
SID... - controls the number of xrays that reach the detector (ISL)
, non-ionizing radiation - power lines, radio waves, microwave, infrared, visible
ionizing radiation - UV, x-ray, gamma ray
x-rays behave as... - waves or particles. (known as wave-particle duality)
energy transfer - phton to matter = ionization. 2 processes, photoelectric absorption, compton scattering
PE effect - the release of electrons from mattter upon absorption of EM radiation (body absorbs the rays)
how are xrays produced - when fast-moving electrons collide with matter
efficiency of xrays - 99% is heat, while only 1% is xrays
conditions necessary to produced xrays - source of electrons - cathode, means to accelerate the
electrons - kV, way of stopping the electrons - anode, vaccum to ensure electrons have no interference
2 types of radiation - Bremsstrahlung and characteristic
bremsstrahlung - electrons interact with the nucleus and of tergat atom and "breaking radiation" is
produced
bremsstrahlung continued - i) makes up 90% of the radiation beam ii) energy is dependant on the distan
b/w electron and nucleus
characteristic radiation - electrons interact with inner shell electrons, ejecting them, vacancy filled by
electrons dropping down from higher energy states, 10% of radiation beam
Types of medical imaging - Structural (anatomy) and functional (physiology)
Structural - X-ray and non x-ray based based (ex. radiography or ultrasound )
Functional - Radioisotope based
Geometric relationships - - Object pralell to IR
- Object and IR perpendicular to CR
- Object as close to IR as possible
geometric factors of unsharpness - SID (bigger sid = better), OID (smaller oid better), Focal spot size
(bigger focal spot = more penumbra)
3 types of movement - Voluntary, involuntary (breathing), equipment
what is scatter? - radiation that has interacted with an attenuator and has changed direction and lost
some of its energy
Exposure factors - kV = tube voltage, mA = tube current, time = length of exposure, distance = SID
kV controls... - the number of xrays produced and the energy of the rays (potential difference between
the anode and cathode)
mA... - controls the number of xrays produced (DSL); current causes thermionic emission (# of x-rays
boiled off)
time... - controls the length of time that radiation is produced, controls the number of xrays produced
SID... - controls the number of xrays that reach the detector (ISL)
, non-ionizing radiation - power lines, radio waves, microwave, infrared, visible
ionizing radiation - UV, x-ray, gamma ray
x-rays behave as... - waves or particles. (known as wave-particle duality)
energy transfer - phton to matter = ionization. 2 processes, photoelectric absorption, compton scattering
PE effect - the release of electrons from mattter upon absorption of EM radiation (body absorbs the rays)
how are xrays produced - when fast-moving electrons collide with matter
efficiency of xrays - 99% is heat, while only 1% is xrays
conditions necessary to produced xrays - source of electrons - cathode, means to accelerate the
electrons - kV, way of stopping the electrons - anode, vaccum to ensure electrons have no interference
2 types of radiation - Bremsstrahlung and characteristic
bremsstrahlung - electrons interact with the nucleus and of tergat atom and "breaking radiation" is
produced
bremsstrahlung continued - i) makes up 90% of the radiation beam ii) energy is dependant on the distan
b/w electron and nucleus
characteristic radiation - electrons interact with inner shell electrons, ejecting them, vacancy filled by
electrons dropping down from higher energy states, 10% of radiation beam
