Alternative Imaging modalities Flashcards
other modalities
CT
MRI
Ultrasound
Nuclear medicine
combination - pet ct, pet mri
what is CT used for
soft tissue
CBCT features
cone shaped beam
low dose
poor soft tissue contrast
radiographic contrast not required
patient sitting upright/standing
disadvantages of CBCT and CT
metalic artefacts
expensive
what does smaller voxels result in
higher resolution
what does windowing do
alters levels of densities visualised in scan to optimally look at specific tissues
MRI magnetic field?
whole room is magnetic field
imgaing coil placed over region of intered to gain higher resolution
What colour is cortical bone
black
T1 is good for?
anatomy - fat is white
T2 is good for?
pathology - fat and fluid is white
ads of MRI
no ionising radiation
very good at imaging soft tissues
Dis of MRI
multiple contraindications
length scans
claustrophobia
contraindications for MRI
pacemaker
orbital foreign bodies
aritificial heart valves
surgical clips
Uses of MRI in dentistry
TMJ
salivary glands
what is ultrasound good for
superficial structures
what waves in ultrasound
sound waves
ads of ultrasound
no ionising radiation
good for superficial structures
real time imaging
dis of ultrasound
operator dependant
cant penetrate bone
only superficial structures are seen
what in nuclear medicine
PET
SPECT
scitinigraphy
patient injected intra-venously which when decays emits particles that are picked up on gamma camera
