Radiology EXAM 3
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172 Terms
axial
what plane is this
coronal
what plane is this slice
sagittal
what plane is this
beam hardening
increase in beam energy due to the preferential absorption of LOWER-energy photons
cupping
distortion of metallic structure
hypodense
LESS attenuating structures that appear DARKER on imaging compared to surrounding tissues.
hyperdense
MORE attenuating structures on imaging, appearing BRIGHTER
MARs (metal artifact reduction)
software applied during reconstruction to minimize image artifacts caused by metal
beeam hardening (braces)
what is the cause of this artifact
increase number of views and exposure (increase #xrays and dose)
what can you do to decrease artifact
false
T/F CBCT provide equally good SOFT TISSUE quality as MDCT
mental foramen
what is the structure indicated by the arrow
hard palate
identify the structure
mandibular condyle
identify the structure
C2 odontoid process
what is 43
coronoid process
what is 52
orbit
what is 6
once
how many times does a CBCT rotate around a patient
false
T/F all else equal a LARGER field of view scan has MORE detail
undersampling/moire
what do you call the artifact seen here that causes alternating light and dark lines (not the metal)
cephalometric projections
CBCT raw images are similar to
hyperdense
in CBCT fluid is more _____ than air
metal
what is the most HYPERdense in CBCT
air
what is the most HYPOdense in CBCT
decrease: mA, FOV, exposure, and kVp
how is DOSE decreased in CBCT
true
T/F CBCT imaging results in less radiation exposure than MDCT
MDCT
which type of CT has the better soft tissue contrast
false
T/F CBCT with smaller voxel ALWAYS result in better spatial resolution
coronoid process
identify the structure
bone height
during implant planning, CBCT improves success by measuring…
maxillary sinus
identify the structure
pyramid
what is the shape of CBCT beam
ramus (mandible)
identify structure
coronoid process
identify structure
submandibular fossa
identify 5
inferior alveolar canal
identify the structure
mandibular foramen (behind molars)
identify structure
mental foramen
identify the structure
lingual foramen
identify the structure
mandibular condyle
identify structure
glenoid fossa
identify the structure
articular eminence
identify the structure
styloid process
identify the structure
mastoid process
identify the structure
mastoid air cells
identify the HYPOdense structures
external auditory canal
identify the structure
maxillary tuberosity
identify the structure
hard palate
identify the structure
nasopalatine canal
identify the structure indicated by the ARROW
incisive foramen
identify the structure
anterior nasal spine
identify the structure
zygomatic process
identify the structure
zygomatic arch
what is indicated by the YELLOW
middle turbinates/concha
identify the structure
inferior nasal meatus
identify structure
nasal septum
identify structure
nasolacrimal duct
identify the structure
maxillary sinus
what is indicated by the GREEN dot
ostium (of maxillary sinus)
identify the structure
uncinate process
identify structure
sphenoid sinus
identify the structure
frontal sinus
identify the structure
ethmoid air cells
identify the structures
orbit
identify the structure
infraorbital foramen
identify structure
nasopharynx
identify the region indicated
oropharynx
identify 5
soft palate
identify the structure
tongue
identify the structure
palatine tonsils
identify the structure
epiglottis
identify the structure
epiglottis
identify the structure
C1
identify the structure
lateral pterygoid plate
what structure is the arrow pointing to
pterygopalatine fossa
identify the structure
hyoid
identify the structure
sella turcica
identify the structure
axial
what plane is this
level of maxilla (above maxillary teeth)
at what level is this
mandibular condyle
what structure is this
coronoid process
what structure is this
maxilla
which arch is this
pterygoid process
identify the structure
mandible
which arch is this
mandibular foramen
identify structure
apical of roots
at what level is this
genial tubercule
identify structure
coronal
what plane
posterior of maxillary sinus
where is this slice
mental foramen (at premolar region)
identify the structure
molar region
where is this slice located
mandibular canal/inferior alveolar canal
what is the ARROW pointing to
orbital roof
what are the arrows pointing to
nasal floor
identify the structure indicated by the ARROW
midline (presence of septum)
what is the location of this slice
nasal bone
identify the structure
inferior turbinate/cochae
identify the structure
many sequential 2D projection images
how is CBCT capture
computer
what generates image volume in CBCT
INCREASED: energy, penetrability and dose, DECREASED: contrast and beam hardening artifact
result of INCREASED kVp