Bushong Midterm
The most widely used support structure for the x-ray tube is the ______________. -
answer ceiling support system
The external structure of the x-ray tube includes the support structure, the protective
housing, and the ___________. - answerglass envelope
As an x-ray tube ages, the inside can become coated with tungsten, which can cause
_____ in the tube. - answerarcing
The negative side of the x-ray tube holds the ________. - answerfilament
What is the most common cause of tube failure? - answertungsten vaporization
The filament is made of __________. - answerTungsten
Thermionic emission at the filament creates a __________. - answerspace charge
The rotating anode is turned by a ____________. - answermagnetic field
When electrons bombard the target, ____% of their kinetic energy is converted to heat.
- answer99%
The target of the rotating anode is usually coated with a ___________ alloy. -
answertungsten
The ___________ is the source of radiation in the x-ray tube. - answerfocal spot
Because of the line focus principal, the effective focal spot size decreases with
decreasing _____________. - answertarget angle
High-capacity tube rotors revolve at ______ rpm. - answer10,000 rpm
The x-ray intensity is lower on the anode side of the tube because of the _________. -
answerheel effect
The cathode side of the tube should be directed toward the _____ part of the patient. -
answerthicker
What is the formula for heat units for a 3-phase, 6-pulse x-ray machine? - answerkVp *
mA * seconds * 1.35
Tube failure can occur from _______________. - answerlong exposure times
, The filament in an x-ray tube is about _____ cm in length. - answer1 to 2
A dual focus tube has two _______. - answerfilaments
Each tube has its own tube rating chart to show __________________. -
answermaximum exposure times
X-rays are produced with isotropically which means they are with ________ _________
in all directions. - answerequal intensity
The modern x ray tube is a ____________ tube. - answerCoolidge
The x-ray tube current is adjusted by controlling the ________ current. - answerfilament
either filament can be used with the lower mA stations about ____ mA or less. -
answer300
_______ mA or higher, only the larger focal spot is allowed - answer400
The anode serves three functions... - answerelectrical conductor, good thermal
dissipator, mechanical support for the target
Tungsten is the choice material for x-ray anodes because of its: - answeratomic number
(74), thermal conductivity, high melting point (3400C)
The effective focal spot is ... - answerthe area of the focal spot that is projected out of
the tube toward the object being radiographed
Diagnostic x-ray tubes have target angles from ___ to ___ degrees. - answer5 to 20
The advantage of the line focus principle is ... - answerimproves spatial resolution and
heat capacity
Patient dose from diagnostic x-rays is most often reported in ____________________. -
answerEntrance Skin Dose
______________ * ____________ = ESE - answeroutput intensity * mAs
__________*___________ = exposure - answerExposure rate * Exposure time
Acute skin effects from radiation exposure have been reported following _____ exams. -
answerangio/interventional
The first American death caused by radiation exposure was ... - answerThomas
Edison's Assistant Clarence Dally
The most widely used support structure for the x-ray tube is the ______________. -
answer ceiling support system
The external structure of the x-ray tube includes the support structure, the protective
housing, and the ___________. - answerglass envelope
As an x-ray tube ages, the inside can become coated with tungsten, which can cause
_____ in the tube. - answerarcing
The negative side of the x-ray tube holds the ________. - answerfilament
What is the most common cause of tube failure? - answertungsten vaporization
The filament is made of __________. - answerTungsten
Thermionic emission at the filament creates a __________. - answerspace charge
The rotating anode is turned by a ____________. - answermagnetic field
When electrons bombard the target, ____% of their kinetic energy is converted to heat.
- answer99%
The target of the rotating anode is usually coated with a ___________ alloy. -
answertungsten
The ___________ is the source of radiation in the x-ray tube. - answerfocal spot
Because of the line focus principal, the effective focal spot size decreases with
decreasing _____________. - answertarget angle
High-capacity tube rotors revolve at ______ rpm. - answer10,000 rpm
The x-ray intensity is lower on the anode side of the tube because of the _________. -
answerheel effect
The cathode side of the tube should be directed toward the _____ part of the patient. -
answerthicker
What is the formula for heat units for a 3-phase, 6-pulse x-ray machine? - answerkVp *
mA * seconds * 1.35
Tube failure can occur from _______________. - answerlong exposure times
, The filament in an x-ray tube is about _____ cm in length. - answer1 to 2
A dual focus tube has two _______. - answerfilaments
Each tube has its own tube rating chart to show __________________. -
answermaximum exposure times
X-rays are produced with isotropically which means they are with ________ _________
in all directions. - answerequal intensity
The modern x ray tube is a ____________ tube. - answerCoolidge
The x-ray tube current is adjusted by controlling the ________ current. - answerfilament
either filament can be used with the lower mA stations about ____ mA or less. -
answer300
_______ mA or higher, only the larger focal spot is allowed - answer400
The anode serves three functions... - answerelectrical conductor, good thermal
dissipator, mechanical support for the target
Tungsten is the choice material for x-ray anodes because of its: - answeratomic number
(74), thermal conductivity, high melting point (3400C)
The effective focal spot is ... - answerthe area of the focal spot that is projected out of
the tube toward the object being radiographed
Diagnostic x-ray tubes have target angles from ___ to ___ degrees. - answer5 to 20
The advantage of the line focus principle is ... - answerimproves spatial resolution and
heat capacity
Patient dose from diagnostic x-rays is most often reported in ____________________. -
answerEntrance Skin Dose
______________ * ____________ = ESE - answeroutput intensity * mAs
__________*___________ = exposure - answerExposure rate * Exposure time
Acute skin effects from radiation exposure have been reported following _____ exams. -
answerangio/interventional
The first American death caused by radiation exposure was ... - answerThomas
Edison's Assistant Clarence Dally
