The patient as a beam Emitter Flashcards
Reduction in x-ray photons remaining in beam after passing through given thickness of materials called
attenuation
Increased part thickness results in WHAT attenuation
A) decrease
b) increase
a
Result of photoelectric absorption
a) no useful information
b) radiographic significant information
b
Result of Compton scattering
a) no useful information
b) radiographic significant information
a
the greatest variable the radiographer faces when performing a radiographic procedure is ?
The patient
the four major substance for x-ray absorption is?
air, fat, muscle, bone
Image receptor exposure will be altered by changes in amount or type of tissue being irradiated
a) density
b) contrast
a
Degree of differential absorption resulting from differing absorption characteristics of tissues in body
a) contrast
b) density
c) subject detail
a
Misrepresentation of the size and shape of anatomy due to its orientation to path of x-ray beam
subject distortion
Increase tissue thickness, effective atomic number, and/or tissue density
a) destructive conditions
b) additive conditions
a
k V p generally adequate for most additive conditions by how much percent
a) 3-10
b) 60-70
c) 5-15
c
Decrease tissue thickness, effective atomic number, and/or tissue density
a) deconstructive conditions
b) additive conditions
a
empyema, additive or destructive?
pus in thoracic cavity cause increase in tissue density
additive
emphysema, additive or destructive?
decrease lung tissue density
destructive
Atelectasis
collapse of lungs
Chest Atelectasis Bronchiectasis Cardiomegaly Congestive heart failure (C H F) Empyema Pleural effusions Hemothorax and hydrothorax
Additive or destructive
additive
Abdomen Aortic aneurysm Ascites Cirrhosis Calcified stones
Additive or destructive
additive
Chest Emphysema Large pneumothorax C O P D Abdomen Aerophagia Bowel obstruction Ileus
Additive or destructive
destructive
Extremities and skull Active osteomyelitis Aseptic necrosis Carcinoma Degenerative arthritis Fibrosarcoma Gout
Additive or destructive
destuctive
are additive conditions directly or inversely related to the image receptor exposure?
Inversely
are destructive conditions directly or inversely related to the image receptor exposure?
directly
Generally at least a WHAT % loss in bone mineral density has taken place before it can be seen radiographically
50%
A decrease of 25 - what percent in was will compensate for most pathological conditions
25-50%
