Hospital Corpsman Navedtra 14295A Chapter 17 Radiology

Front 1

Which scientist first discovered X-Rays?
1. Wilhelm Konrad Roentgen
2. Doctor H. G. Gama
3. Doctor Otto Proton
4. Raymond Cathode

Back 1

The rays were discovered in 1895 by a scientist, Wilhelm Conrad Roentgen.

Front 2

What is the name of the tube that was discovered in 1895?
1. Crooke’s tube
2. Roentgen’s tube
3. Walkoff tube
4. Evacuating tube

Back 2

The rays were discovered in 1895 by a scientist, Wilhelm Conrad Roentgen. While experimenting with a device called a Crooke’s tube, which generated cathode rays.

Front 3

Which of the following is NOT a characteristic property of X-Rays?
1. They travel in straight lines
2. They travel at the speed of sound
3. They cause irritation to living cells
4. They cause certain substances to fluoresce

Back 3

Some of the characteristics and properties of Xrays
are:
• They travel in straight lines at the speed of light
• They affect photographic film by producing a hidden image made visible by processing
• They cause certain substances to fluoresce (glow)
• They cause irritation of living cells. In large amounts can cause necrosis (death) of the cells, a fact that necessitates caution in using X-rays

Front 4

The rule that applies to the principle of radiation safety is?
1. ALARA
2. SAMS
3. CORPS
4. SAFETY

Back 4

A good rule is the acronym, ALARA, "As Low As Reasonably Achievable."

Front 5

When taking radiographs, always drape the patient with a lead apron.
1. True
2. False

Back 5

True

Front 6

The time setting on the X-Ray machine is measured by using which of the following methods?
1. Minutes or impulses
2. Minutes or milliamperes
3. Fractions of a second or milliamperes
4. Fractions of a second or impulse

Back 6

The MAS (milliampere per second) controls the
exposure time to the patient14

Front 7

Which of the following instruction is most important when ordering radiographs for female patients?
1. Have the patient remove her eyeglasses
2. Have the patient remove her earrings
3. Ask the patient is she has any type of denture
4. Ask the patient if she is pregnant

Back 7

Ask the patient if she is pregnant
Before taking radiographs on a female, always ask whether or not she is pregnant or if pregnancy is questionable. If there is belief of a pregnancy, consult a provider.

Front 8

The film badge should be placed behind the lead-lined barrier at least what number of feet from the tube head?
1. 10
2. 6
3. 8
4. 4

Back 8

The badges are placed in the X-ray room behind the technician’s protective lead-lined barrier or at least 6 feet from the tube head and never in the direct line of radiation during exposure.

Front 9

Which of the following is NOT a safety precaution for taking radiographs?
1. Always stand behind a lead screen during an exposure
2. Never stand in the path of the central X-Ray beam during exposure
3. Never hold the tube head or the tube head cylinder of the X-Ray machine during exposure
4. Hold the film packet in the patient’s mouth during exposure if necessary

Back 9

Hold the film packet in the patient’s mouth during exposure if necessary
• NEVER stand in the path of the central Xray
beam during exposure
• NEVER hold the X-ray film packet in the patient's mouth during a dental exposure
• NEVER hold the tube head or the tube head cylinder of the X-ray machine during exposure
• ALWAYS stand behind a lead-lined window during an exposure

Front 10

Which of the following personnel are authorized to order and diagnostically interpret dental radiographs?
1. Dental X-Ray technician
2. Front desk personnel
3. Dental officers
4. Dental technicians

Back 10

Dental officers

Front 11

How often should the surfaces in the dark room be disinfected?
1. Daily
2. Weekly
3. Bi-weekly
4. Monthly

Back 11

Daily

Front 12

Of the following personnel who is NOT allowed to order radiographs?
1. IDC
2. HM
3. PA
4. MO

Back 12

HM
Only a Medical Officer, Dental Officer, Nurse Practitioner, Physician Assistant (PA) and Independent Duty Corpsmen (IDC) can order a radiographic examination.

Front 13

All of the following are indications for a PA of the chest, EXCEPT?
1. Pain with respiration
2. Chronic cough
3. Asbestos
4. Rash and streaking

Back 13

Rash and streaking

Front 14

Which of the following oragns will not be seen in a KUB radiograph?
1. Kidney
2. Liver
3. Ureters
4. Bladder

Back 14

Liver

Front 15

Which of the following structures will be seen in the AP projection of the cervical spine?
1. C1-T3
2. C2-T4
3. C3-T1
4. C4-T2

Back 15

3. C3-T1

Front 16

A patient presenting with chronic cervical spine pain should be ordered what type of radiograph?
1. KUB
2. AP Cervical Spine
3. Pelvic
4. Chest PA

Back 16

2. AP Cervical Spine

Front 17

At approximately what angle should the ankle be when taking an oblique radiograph?
1. 30
2. 45
3. 60
4. 90

Back 17

Grasp the lower femur with one hand and the foot with the other. Internally rotate the entire leg and foot together until the 45-degree position is achieved

Front 18

What should be shielded when you are taking an X-ray?
1. Hypothalamus
2. Heart
3. Reproductive organs
4. Scrotum

Back 18

Reproductive organs

Front 19

The paralleling device consists of which of the following parts?
1. A locator ring
2. An indicator rod
3. A bite-block
4. All of the above

Back 19

All of the above

Front 20

The bisecting angle technique is the preferred method and recommended for routine use when taking periapical radiographs.
1. True
2. False

Back 20

False
Use the bisecting-angle technique when paralleling devices are not available; when a patient finds it painful or impossible to close on the bite-block; or when an X-ray is needed when a rubber dam is in place.

Front 21

When taking radiographs, which of the following factors should you consider before using the bisecting-angle technique?
1. There are no paralleling devices available
2. The patient cannot close mouth on bite-block
3. The patient has a rubber dam in place
4. All of the above

Back 21

Use the bisecting-angle technique when paralleling devices are not available; when a patient finds it painful or impossible to close on the bite-block; or when an X-ray is needed when a rubber dam is in place.

Front 22

What landmark is used when exposing the maxillary bicuspid area?
1. Tip of the nose
2. Beside the ala of the nose
3. Below the pupil of the eye
4. Below the out angle of the eye and below the zygomatic bone

Back 22

Maxillary bicuspid area: Landmark 3,
below the pupil of the eye.

Front 23

The position of the patient’s mid-sagittal plane must be perpendicular to the floor when exposing a periapical radiograph using the bisecting-angle technique.
1. True
2. False

Back 23

True
Remember that the patient's midsagittal plane must be perpendicular to the floor.

Front 24

The occlusal film packet contains two X-Ray films.
1. True
2. False

Back 24

Unlike the periapical and bitewing packets, the occlusal packet contains two X-ray films. This allows different developing times to be used for these films.

Front 25

What X-Ray machine settings should you use when exposing a maxillary occlusal radiograph on an adult?
1. 10 mA, 87kVp, and 60 impulses
2. 12 mA, 90kVp, and 60 impulses
3. 10 mA, 90kVp, and 60 impulses
4. 12 mA, 87kVp, and 40 impulses

Back 25

Set the X-ray machine at 10 mA, 90 kVp,
and 60 impulses (1 second).

Front 26

What vertical angulation setting should you use when exposing a maxillary anterior occlusal radiograph?
1. +50 degrees
2. +55 degrees
3. +60 degrees
4. +65 degrees

Back 26

+65 degrees
For maxillary anterior occlusal radiographs, set the vertical angulation of the tube head at +65°. Center the tube head cylinder on the bridge of the patient's nose.

Front 27

When exposing a maxillary posterior occlusal radiograph, you should use what vertical angulation setting?
1. +75 degrees
2. +70 degrees
3. +65 degrees
4. +60 degrees

Back 27

+75
For maxillary posterior occlusal radiographs, set the vertical angulation of the tube head at +75°. Center the tube head at the top of the patient's nose.

Front 28

When exposing a mandibular anterior occlusal radiograph, what vertical angulation should you use?
1. -10 degrees
2. 5 degrees
3. 0 degrees
4. +5 degrees

Back 28

-10
For mandibular anterior occlusal radiographs, set the vertical angulation of the tube head at - 10°. Center the tube head cylinder on the tip of the patient’s chin.

Front 29

A safe light is the only safe source of illumination used in the darkroom when processing radiographs.
1. True
2. False

Back 29

True

Front 30

When checking for light leaks in the darkroom, you should leave the penny on the X-Ray film for at least what number of minutes?
1. One
2. Five
3. Three
4. Seven

Back 30

5
1. Obtain a piece of unexposed X-ray film.
2. Lay the film on the workbench, and place a penny over it for a period of 5 minutes.
3. Process the film.
4. The processed film should show no image. If the outline of the penny can be seen, there is light leakage and the HM should inform the supervisor.

Front 31

Which of the following methods is most commonly used to process dental radiographs in the Navy?
1. Laser processing
2. Manual processing
3. Computer processing
4. Automatic processing

Back 31

Automatic processing is the most commonly used method of processing medical and dental radiographs in the Navy.

Front 32

Which of the following procedures should be included in the daily maintenance of the X-Ray machine?
1. Dusting
2. Cleaning with a cloth moistened with water
3. Both 1 and 2
4. Cleaning with a cloth moistened with solvent

Back 32

Cleaning with a cloth moistened with water

Front 33

You should wait what number of seconds between films before inserting another film into the automatic processor?
1. 10
2. 12
3. 15
4. 30

Back 33

15

Front 34

The developer and fixer solutions in the automatic processor should be changed at what minimum frequencies?
1. Daily
2. Weekly
3. Biweekly
4. Every 3 to 4 weeks

Back 34

Every 3 to 4 weeks

Front 35

The processing solutions used in the automatic processor are the same as those used in the manual processing procedure.
1. True
2. False

Back 35

False

Front 36

The cleaning of the roller transports and the solutions in the automatic processor are accomplished at what minimum intervals?
1. Twice a day
2. Daily
3. Weekly
4. Monthly

Back 36

Monthly

Front 37

Which teeth can be identified radiographically by a large white region caused by the bone of the nasal septum?
1. Mandibular incisors
2. Mandibular cuspids/bicuspids
3. Maxillary incisors
4. Maxillary incisors and bicuspids

Back 37

Maxillary Incisor Area
Radiographs of this area usually show a large white region caused by the bone of the nasal septum.

Front 38

When mounting radiographs, the raised dimple should be facing you.
1. True
2. False

Back 38

True

Front 39

You should attempt to complete all X-Ray repairs yourself.
1. True
2. False

Back 39

False