MAJOR PARTS OF A GENERAL X-RAY UNIT

Question 1

Low tension cables

Answer 1

• These are current carrying conductors whose insulation can
  withstand a maximum voltage of up to 1000volts.
• They have three colour codes

Question 2

ow tension cables colour codes

Answer 2

1. live wire = Brown
2. Neutral wire = Blue
3. Earth wire = green

Question 3

High tension cables

Answer 3

• These cables are used in the high-tension circuit of the x-ray machine.

Question 4

what surround the high tension cables

Answer 4

• They are surrounded by a thick rubber insulation which is then enclosed by a metallic braid.

Question 5

function of the metallic braid

Answer 5

Protects the wires when bending

Question 6

High Tension transformer

Answer 6

• Its function is to provide the high voltage necessary for x-ray production

Question 7

X-RAY TUBE

Answer 7

Source of radiation

Question 8

2 parts of x-ray tube

Answer 8

1. The cathode assembly
2. The anode

Question 9

X-ray tube housing

Answer 9

1. The x-ray tube is located inside Barrel shaped housing
2. protects and insulates the x-ray tube.
3. Provides for the attachment of the light beam diaphragm

Question 10

X-ray tube support

Answer 10

• It provides support and mobility for the tube
• It also holds the tube during the exposure rendering it immobile this reduces motional Un sharpness and accidental falling on the patient

Question 11

There are five systems of tube support

Answer 11

• Overhead (ceiling) tube suspension system
• The floor-to-ceiling suspension system
• Floor suspension system
• C-arm tube suspension system
• A mobile tube suspension system

Question 12

Advantages of ceiling suspended

Answer 12

• Uncluttered flow space due to absence of floor track
• Greater area of the room made available for radiography due to increased transverse movement of the tube
• flexibility in positioning as it allows a wide range of movements
• Ability to radiograph patients on accident trolley, wheel chairs etc
• Ability to take lateral views either side of the table/ horizontal shot
  thru

Question 13

disadvantage of ceiling suspended

Answer 13

• Possible need to reinforce the ceiling to provide necessary strength to hold the tracks, suspension and tube
• Need for minimum room height
• Extra length of high-tension cable needed to cover the increased area.

Question 14

Control console

Answer 14

• A device that allows the radiographer to manipulate the exposure factors and to initiate the exposure

Question 15

Parameters on the control console

Answer 15

1. Power switch
2. mA switch
3. mAs switch
4. KvP switch
5. Timer
6. Exposure switch
7. prep or rotor

Question 16

prep|rotor

Answer 16

Prepares the tube for exposure

Question 17

Types of collimators

Answer 17

• Manually controlled
• Automatically controlled

Question 18

A manual Collimator

Answer 18

• A box like device that controls that control the size of the field to be irradiated
• The LBD casing has many features that facilitate movement of
  the tube

Question 19

Auto collimator

Answer 19

• Equipped with Positive Beam Limitation
• Automatically adjust the radiation field size to size of the image receptor while others prevent exposure until the field has been manually adjusted to the size of IR or smaller