Radiology Ch 22 & 23

Front 1

CH 22-

purpose of panoramic radiography

Back 1

to evaluated impacted teeth

eruption patterns

detect disease

lesions

jaw conditions

Front 2

what is panoramic radiography NOT useful in diagnosing?

Back 2

Caries
Perio disease
Periapical lesions

Front 3

Tomography:

Back 3

Radiographic technique that allows imaging of one layer at a time (while blurring other structures in other planes)

Front 4

Focal Trough "Image layer":

Back 4

the 3-D, curved zone where structures are clearly demonstrated on the film.

Front 5

The quality of the radiograph depends on the positioning of the teeth within the_____

Back 5

focal trough

Front 6

Usually the focal trough is _____ in the anterior region and _____ in the posterior region

Back 6

Narrow in anterior and wide in the posterior

Front 7

X-ray Tubehead*

Back 7

the collimater used in the pano machine is a lead plate with an opening in the shape of a narrow vertical slit.

Front 8

The tubehead rotates _____ the patient as the film rotates ______ of the patient*

Back 8

the tubehead rotates BEHIND the patient as the film rotates IN FRONT of the patient.

Front 9

Head positioners*

Back 9

used to align the teeth in the focal trough correctly
-chin rest
-notch bite block

-lateral head support

Front 10

Exposure controls*

Back 10

exposure time cannot be altered, but mA and kVp can be adjusted to the pt needs

Front 11

screen film:

Back 11

-sensitive to light

-between 2 intensifying screens

-less radiation than non-screen film

-more sensitive to visible light

-sensitive to green light/blue light (green faster)

Front 12

T/F Intensifying screen INCREASES amount of radiation needed to produce an image

Back 12

FALSE: it REDUCES the amount of radiation needed to produce an image

Front 13

Calcium tungstate screens emit:

Back 13

blue light

Front 14

rare earth screens:

Back 14

emit GREEN light, require less radiation (4X faster)

Front 15

The cassette is used to

Back 15

hold the film and intensifying screens together

Front 16

step by step procedures

Back 16

1. equipment prep

2. pt prep

3. Pt positioning

Front 17

T/F the lead apron has a thyroid collar for panos

Back 17

FALSE- NO thyroid collar attached

Front 18

the imaginary plane passes through the

Back 18

top of the ear and the bottom of the eye socket

Front 19

position the tongue_____ and the lips_____

Back 19

tongue goes on the roof of the mouth, and the lips around the bite-block

Front 20

Pt prep error:

Ghost Images*

Back 20

resembles its counterpart and is found on the opposite side of the film, larger and higher than it's counterpart

-caused by metallic or radiodense objects

Front 21

Pt positioning error:

Positioning of the lips (closed) and tongue (raised):

Back 21

a dark radiolucent band/shadow can obscure the image

Front 22

the hard palate and floor of the nasal cavity appear superimposed over the max. teeth
"reversed smile line"

Back 22

Frankfort plane error-chin upward

Front 23

"exaggerated smile" line

Back 23

Frankfort plane error-chin down

Front 24

anterior teeth appear skinny and out of focus

Back 24

Anterior to focal trough

Front 25

anterior teeth appear fat and blurred

Back 25

posterior to focal trough

Front 26

unequal magnification

Back 26

midsagittal plane position error

Front 27

pt not standing tall and straight, spine appears apparent down center of film

Back 27

position of spine

Front 28

CH 23
purpose of extra oral radiography

Back 28

Allows dentist to view a large area of the jaws and skull on a single film

Front 29

x-ray unit:

Back 29

-standard intraoral machine can be used for transcranial and lateral jaw projections.

Front 30

cephalostat:

Back 30

a special extension arm and device that holds the film and positions the head

Front 31

film:

Back 31

screen film or occlusal film may be used for some extraoral radiographs

Front 32

Grid*

Back 32

a device used to reduce the amount of scatter radiation

Front 33

step by step procedures:

Back 33

same as pano
1. equipment prep

2. pt prep

3. pt positioning

Front 34

Lateral Jaw Radiography:

Back 34

used to examine the posterior region of the mandible

Front 35

2 types of lateral jaw radiography

Back 35

Body of Mandible Projection
Ramus of Mandible Projection

Front 36

Lateral Cephalometric Projection

Back 36

To evaluate facial growth and development, trauma, disease etc

Front 37

Posteroanterior projection:

Back 37

View of the frontal and ethmoid sinuses, the orbits and nasal cavity

Front 38

Waters projection:

Back 38

View of the maxillary sinuses

Front 39

Submentovertex projection

Back 39

view condyles and their position, base of the skull, zygomatic arch, and sphenoid and ethmoid sinusesk

Front 40

Reverse Town Projection:

Back 40

View of condylar neck and ramus

Front 41

TMJ radiography

Back 41

only the bones can be viewed, not the entire joint structure-soft tissue

Front 42

Transcranial Projection*:

Back 42

-view of the superior surface of the condyle and the articular eminence

-intraoral unit can be used*

Front 43

TMJ tomography

Back 43

similar to a pano-obtaining a section of an image while other areas are blurred