ch. 11 equipment design Flashcards
xray tube housing leakage must not exceed ___ mR/hr at 1 m
___ mGy/hr at 1 m
100 mR/hr; 0.88 mGy at 1m
console must be (mobile/fixed) behind shielded barrier
fixed
_____ and _____ are required during exposure
tone and x-ray sign
what are most x-ray tables made of?
radiolucent carbon fiber
SID receptor: within 2% for _________ measurements
distance
SID receptor: within 1% for ___________ measurements
centering
SID receptor; within _% (distance) and _% (centering) of the SID
2% distance, 1% centering
distance required between collimator and patient skin for fixed units
15 cm
distance required between collimator and patient skin for portable units
30 cm
the brightness of a surface is termed
luminance
acceptable exposure reproducibility variance
5%
acceptable exposure linearity variance
10%
what x-ray feature was required at one point but is no longer required on manufactured units?
positive beam limitation (PBL)
Total Filtration = ___ mm (lead/aluminum) equivalent
2.5mm aluminum
Consistency in output in radiation intensity for identical generator settings from one individual exposure to subsequent exposures
exposure reproducibility
Consistency in output radiation intensity at selected kVp settings when generator settings are changed from one mA and time combination to another
exposure linearity
acceptable exposure linearity coefficient
0.1
indirect conversion image pathway (1 of 2)
scintillator, photodiode, thin film transistor array, electrical signals
indirect conversion image pathway (2 of 2)
scintillator, charged coupled device array, electrical signals
direct conversion image pathway
photoconductor, thin film transistor array, electrical signals
converts x-ray energy into visible light
scintillator
converts x-ray energy into electrical signals that are read by transistors
photoconductors
primary protective barrier requires a __ mm (lead/aluminum) equivalent
2mm lead
