radiology

which of the following describes a use of a panoramic film
A. diagnosis of caries
B. evaluation of impacted molars
C. evaluation of periodontal disease
D. evaluation of periapical disease

the zone in which structures are clearly demonstrated on a panoramic radiograph is termed the:
A. midsagittal plane
B. rotation center
C. ghost image
D. focal trough

rare earth intensifying screens are recommended in panoramic radiography because:
A. rare earth screens provide more diagnostic image
B. the images convert faster in automatic processors
C. rare earth screens require less x-ray exposure for patient
D. rare earth screens emit a blue light

a thyroid collar is not recommended in panoramic radiography because:
a. it blocks the xray beam and obscures information
b. there is a relatively low dose of radiation to the thyroid gland in a panoramic radiography
c. it is impossible to sterilize the thyroid collar
d. all of the above

the imaginary line that passes from the bottom of the eye socket through the top of the ear canal is termed the:
A. midsagittal plane
B. vertebral plane
C. orbital plane
D. frankfort plane

the film and tubehead rotate around the patient
a. pano
b intraoral
c. both pano and intraoral

this type of radiograph is used to examine the extent of large leasions
a. pano
b intraoral
c. both pano and intraoral

the dental arches must be positioned in a focal trough
A. pano
B. intraoral
C. both pano and intraoral

the tubehead contains a filament used to produce electrons and a target is used to produce xray
A. pano
B. intraoral
C. both pano and intraoral

the collimator is a lead plate with an opening in the shape of a narrow vertical slit
A. pano
B. intraoral
C. both pano and intraoral

the collimator is a lead plate with a small, round or rectangular opening
A. pano
B. intraoral
C. both pano and intraoral

the vertical angulation of the tubehead is variable
A. pano
B. intraoral
C. both pano and intraoral

a head positioner is used to position the patient's head
A. pano
B. intraoral
C. both pano and intraoral

screen film is used
A. pano
B. intraoral
C. both pano and intraoral

a cassette holder with two intensifying screens is used
A. pano
B. intraoral
C. both pano and intraoral

the xray film must be loaded into a cassette in a darkroom under safelight conditions
A. pano
B. intraoral
C. both pano and intraoral

a lead apron with a thyroid collar must be placed on patient
A. pano
B. intraoral
C. both pano and intraoral

all jewelry (earings and necklaces) must be removed before exposure of films
A. pano
B. intraoral
C. both pano and intraoral

the midsagitatal plane must be positioned perpendicular to the floor
A. pano
B. intraoral
C. both pano and intraoral

the vertebral column must be perfectly straight
A. pano
B. intraoral
C. both pano and intraoral