CT Scan Machine

1. Accuracy of Slice thickness
2. Accuracy of Operating Potential
3. Accuracy of Timer
4. Total filtration
5. Linearity of mA/mAs loading Stations
6. Consistency of radiation output
7. Radiation dose test
8. CTDIw for Head Phantom
9. CTDIw for Body Phantom
10. Low contrast resolution
11. High contrast resolution
12. Radiation leakage level from X-ray tube housing
13. Area Surveillance

The use of CT equipment has increased many-fold during the past decade. The CT equipment has a higher radiation hazard potential as compared to the general X-ray equipment. Owing to this reason, a greater amount of discretion is required while prescribing/ performing CT scans.

1. All personnel associated with the use of the CT-Scan equipment, shall attend the training sessions provided by the application specialist of the company and incorporate in practice all the radiation safety measures provided by design, in the equipment.
2. Always work from the control room.
3. Always use the TLD at chest level while CT unit is being operated.
4. Do not allow any person, other than the patient, inside the CT-scan room.
5. CT-scan doors (preferably with automatic closure) must be lead lined with 1.5 mm lead equivalent and closed during exposures.
6. Ensure that Lead apron, with minimum 0.25 mm lead equivalent, is worn by the person assisting an infirm patient during exposure.
7. Shall always use the paediatric protocols of exposures, while exposing child patients.

1. Get CT scans done only in hospitals/facilities having licence from AERB.
2. Do not crowd the room where X-ray is taken. Wait for your turn.
3. Co-operate with the Technologist, to avoid repeat CT-scans.
4. Always wear a lead apron, if you need to assist the patient during CT examination. In no case pregnant woman should assist the patient during exposure.
5. Female patient, if pregnant, must inform the CT Technologist so that necessary precaution can be taken during CT examination.
6. Carry your old X-ray/ CT records.

1. Only AERB Type approved CT equipment shall be installed /used.
2. AERB licence shall be displayed at prominent place near the CT room for public information.
3. The couch shall be placed such that it enables the operator to complete view of the patient from the control room window.
4. Quality Assurance tests of the CT-scan equipment is carried out periodically and after any maintenance and the records thereof are maintained.
5. At least one lead apron (0.25 mm lead equivalent) shall be available.
6. Lead apron(s) shall be stored either on a hanger or on a flat surface without crumpling.
7. Consistency of lead aprons shall be checked once in two years. Qualitative check can be done by taking radiograph of lead aprons.
8. Shall ensure that the application specialists demonstrate all radiation safety features provided by design, in the equipment.
9. Charts of standard exposure parameters to achieve good image quality should be prepared for pediatric and adult patients separately and displayed at a prominent location such as control console.
10. TLD badges are provided to all the operators and workers involved during CT examination.
11. During non-working hours, TLD cards must be stored along with Control TLD card outside the CT room (in a radiation free area).
12. The owner shall ensure that the operator of the CT equipment is well conversant with clinical requirements of the examinations.
13. Radiation symbol and warning placards in local languages are placed outside the X-ray room door.
14. Routine maintenance of the CT equipment is carried out and record thereof is maintained.