# Shared Flashcard Set

## Details

Final Review
60
Physics
03/21/2011

Term
 A bundle of energy is the definition of a(n)?
Definition
 Photon
Term
 Electromagnetic energy travels in a pattern that looks like a?
Definition
 Sine wave
Term
 With Electromagnetic energy what is always constant?
Definition
 Velocity
Term
 Types of ionizing electromagnetic energy include:
Definition
 X-ray, Gamma rays and high energy UV light.
Term
Definition
 Absorb, Transmit
Term
 An object that can always accept electric charges and is therefore required for a "safe" circuit when dealing with high voltages is called an:
Definition
 Ground
Term
 Unlike Charges______, while like charges______.
Definition
 Attract, Repel
Term
 The unit for electric potential?
Definition
 Volt
Term
 Any charged particle in motion will creat a(n)
Definition
 magnetic field
Term
 A device that changes electric current into mechanical motion is call a:
Definition
 Motor
Term
 Increasing beam restriction will:
Definition
 Decrease patient dose
Term
 KVP is also known as the __________ of the beam.
Definition
 Penetrability
Term
 With increasing atomic numbers:
Definition
 absorption rates decrease
Term
 What are some examples of beam restricting devices?
Definition
 diaphragms, cones, collimator
Term
 The collimation device is used primarily to:
Definition
 simulate field size
Term
 The primary purpose of a grid is to:
Definition
 decrease scatter reaching the receptor
Term
 A grid should be used under what circumstance?
Definition
 if the part measures 10cm or greater, or if you are using over 60 KVP.
Term
 Something that is radiopaque will most likely
Definition
 absorb photons.
Term
 Name 3 types of grids:
Definition
 Stationary, focused and parallel
Term
 Name 3 types of grid errors:
Definition
 off-level, off focus, upside down
Term
 Any filtration that is found outside the tube and housing is called:
Definition
Term
 A wedge filter is a good example of a _________ type of filter.
Definition
 Compensating
Term
 The total amount of filtration for any unit that operates above 70 KVP must be at least:
Definition
 2.5 mm AL/eq
Term
 When filtration is increased, technical factors must be:
Definition
 increased
Term
 The reduction of the quantity of photons in the beam after interacting with the patient is known as:
Definition
 attenuation
Term
 Is producing another projectile electron a possibilitie of a x-ray photon when it exists the tube?
Definition
 False
Term
 The interaction that occurs within the patient that is similar to a characteristic interaction at the target is :
Definition
 photoelectric
Term
 A positron and a negatron are produced in:
Definition
 Pair Production
Term
 Scatter that travels back towards the source is called?
Definition
 backscatter
Term
 As radiation passes through the patients body it undergoes?
Definition
 attenuation
Term
 The greatest variable a radiographer faces is the
Definition
 patient
Term
 A pathology that is difficult to penetrate is called a/an ____ condition
Definition
 destructive
Term
 A pathology that is difficult to pentrate is called a/an _____ condition.
Definition
Term
 Which of the following pathologies is not considered an additive condition?   A.) abscess B.) edema c.) ascites D.) atrophy
Definition
 Atrophy
Term
 Which of the following pathologies is not considered an additive condition?   A.) Atelectasis B.) pneumonia c.) emphysema d.) empyema
Definition
 c.) emphysema
Term
 Which pathologic condition involves a collapse of part or the entire lung?   A.) atelectasis b.) pleural effusion c.) hemothorax d.) hydrothorax
Definition
 A.) atelectasis
Term
 Which pathologic condition involves the accumulation of fluid in the peritoneal cavity?   a.) edema b.) renal calculus c.) cirrhoisis d.) ascites
Definition
 d.) Ascites
Term
 Which pathologic condition involves fibrotic changes in the liver parenchyma?   A.) Cirrhosis b.) acromegaly c.) sclerosis d.) ascites
Definition
 a.) cirrhosis
Term
 Which pathological condition involves a tumor arising in the bone and cartilage adding to subject density?
Definition
 ostochondroma
Term
 What are the 2 types of geometric properties of image quality?
Definition
 detail and distortion
Term
 Digital detail is determined primarily by?
Definition
 Pixel size
Term
 A lack of data caused by underexposure is called quantum mottle and is best fixed by:
Definition
 Increasing mAs
Term
Definition
 Decrease magnification and increase detail
Term
 Peristalsis is an example of:
Definition
 Involuntary motion
Term
 The 2 types of distortion are:
Definition
 size and shape
Term
 The only 2 controllers of magnification are:
Definition
 detail and distortion
Term
 The central ray should always be?
Definition
 Perpendicular
Term
 If you angle "towards the patients head", this is termed:
Definition
Term
 Most Positiong text book today use either 72" or ____" for standards
Definition
 40
Term
 What device measures voltage supplied to an x-ray circuit and adjusts that voltage to exactly 220v?
Definition
 Line compensator
Term
 I deal qualities for tabletops used in an x-ray imaging system would include:
Definition
 strong and supportive, absorbent of minimal x-radiation, floating top or motor driven.
Term
 The 3 main components of an x-ray system include the tube, console and:
Definition
 high voltage generator
Term
 The process of changing AC current to DC current is done by:
Definition
 A rectifier
Term
 X-ray generator types include single pase, 3 phase and:
Definition
 high frequency
Term
 Power ratings are measured in
Definition
 watts
Term
 In which part of the tube does thermionic emission occur?
Definition
 filament
Term
 The positive side of the x-ray tube is the
Definition
 anode
Term
 The priniciple that states the effective focal spot is smaller than the actual focal spot is called:
Definition
 line focus principle
Term
 X-ray tube failure can result from:
Definition
 not properly warming the tube, 1 excessive exposure, not allowing the anode to cool.
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