Cone beam CT Flashcards
what is come beam CT
cross-sectional imaging assessing radiodense stuctures
can you get a cone beam CT under the NHS
no
benefits of cone beam CT
no superimposition
ability to view subject from any angle
no magnification
allows 3D reconstruction
disadvantages of cone beam CT
increased radiation dose to pt
lower spatial resolution (not as sharp)
suscpetible to artefacts
complicated to manipulate
additional training required
common uses in dentistry
relationship between impacted mandibular third molar and inferior alveolar canal
measuring bone dimensions to help plan implant placemet
visualising complex root canal
investigating external root resorption
assessing large cystic jaw lesions
common orthogonal planes
axial
sagittal
coronal
what are voxels
3D pixels
increased FOV (field of view)
increased radiation dose
increased number of tissue irradiated
increased scatter
Are the pixels in come beam CT larger or small than intra oral radiograph
larger
radiation dose compared to DPT
2/3 times
2 main types of artefacts
movement
streak
what can streak artefacts prevent assessment of
caries
does cone beam CT visualise soft tissues
no
is additional training required for cone beam CT
yes
