Convention Tomography Equipment

1. Tomographic
Equipment
Presented By: Sarbari. S
Asst.Professor Radiology

2. Tomography Principle
• Tomography is performed when there is overlap
of bony or soft tissue structures at the area of
interest.
• First used in 1935.
• Image produced on film which was parallel to
film.
• Anatomy in plane of fulcrum was in focus and
outside pivot were mechanically blurred.

4. Equipment of Tomography
The equipment of tomography comes varies in appearance and
functions. The main aim is to create a sharp image.
The equipment is of two types:
• Tomographic attachments- Linkage mechanism.
Pivot Unit.
Mechanical Drive.
Drive control
• Tomographic Table - Group I
Group II
Group III

6. Linkage Mechanism
• It is a long telescopic rod which connects the x-
ray tube with bucky mechanism.
• The rod has clamps and locking system to hold
equipment tight.

7. Pivot unit
• It is a turret like structure and
sometimes its called fulcrum tower.
• Function of Pivot point:
• It helps in opposite movement of the
tube and detector.
• It helps in height adjusting of the
tube.
• It is fiited near to the tube which is
near to the tube and linkage
mechanism.
• A scale is present which is adjusted in

8. Mechanical Drive
• The tube travel in various direction is achieved by
mechanical drive.

9. Drive Control
• The control drive is like a control panel of
other equipment it is placed for operation
of the xray tube .
• It is generally wall mounted type.
• The system has options which permits:-
• Selection of tube travel speeds.
• Selection of angle of exposure.
• Trial runs of the tube with out any
exposure.
• Some equipments have warning indicated
to indicate when the tube is energized.

10. Tomography Table
• Tomography tables are planned especially
for tomography but general radiography can
also be performed.
• The tomographic tables are categorized in
3groups:
• Group I
• Group II
• Group III

11. Group I
• These table are simple like an general xray tables.
• They have floating top and tube stand.
• Example- Linear tomography, Arc tomography.

12. Group II
• They are table which allow conventional on table
radiography.
• They are limited to circular and elliptical
tomography.
• They have variable range of motion and adjustment
layers

13. Group III
• These tables are highly specialized.
• Almost all trajectory movements can be done.
• In spite that they have multi directional
exclusions,tube tilt, rotation of the patient,
attachment of TV camera in fluoroscopy.

14. Peculiarities of Tomography
table.
• To produce different type of movement.
• There is control on speed of movement.
• Control on angle of exposure.
• Control on time of exposure.
• Adjust the fulcrum point and height.

15. Features of the Tomographic
equipment
• High Voltage Generator- 500 mA.
• KV-(120-150) Kvp.
• AEC
• APR- Anatomical Programs.
• Angle -40, 30, 20,8 .
• Speed - 0.5 s to 1.5s.
• Height-(0-240) mm.

16. Thank you