Week 14 Ch 24/27: Imaging of pt with special needs; 3-D digital imaging

gag reflex

retching that is elicited by stimulation of the sensitive tissues of the soft palate region

soft palate, posterior 3rd region of tongue

what areas elicit the gag reflex?

psychogenic stimuli

originating in the mind

tactile stimuli

originating from touch

expose premolars then molars, max usually elicit gag reflex

what is the sequence of exposing xrays on pts with gag reflex?

12-18 months

how often to take xrays with absence of caries in primary dentition?

24 months

how often to take xrays with absence of caries in permanent dentition?

cone beam computed tomography (CBCT)

computer-assisted digital imaging; uses cone shaped x-ray beam to acquire information and present it in 3-D; area of interest is termed field of view (fov)

DICOM data

universal format for handling, storing and transmitting 3-D images

multiplanar reconstruction (MPR)

reconstruction of raw data into images when imported into viewing software to create three anatomic planes of the body - axial, coronal, sagittal planes

spatial resolution

measurement of size of pixel in MPR images (in MM)

adv of 3-D imaging

lower radiation dose - compared to traditional medical CT scans; brief scanning time; anatomically accurate images; ability to save an easily transport images

disadv of 3-D imaging

pt movement and artifacts; size of field of view; cost of equipment; lack of training in interpretation of image data on areas outside the maxilla and mandible