23. Every cephalometric x-ray machine shall be equipped with a beam limiting device that limits the size of the useful beam to maximum linear dimensions of thirty-one centimetres by thirty-eight centimetres at the plane of the image receptor.  R.R.O. 1990, Reg. 543, s. 23. TABLE 1 Item   Column 1   Class of Student   Column 2   Supervisor 

  1.   Medical student   Radiologist 

  2.   Dental student   Dentist 

  3.   Dental Hygiene student   Dentist 

  4.   Dental Assisting student   Dentist 

  5.   Chiropractic student   Chiropractor 

  6.   Medical Radiation and Imaging Technologist student   Radiologist or Medical Radiation and Imaging Technologist R.R.O. 1990, Reg. 543, Table 1; O. Reg. 359/19, s. 5. TABLE 2 Item   Column 1 Class of Radiation Protection Officer   Column 2   Class of Facility 

  1.   Medical radiation protection officer   Medical facility 

  2.   Dental radiation protection officer   Dental facility 

  3.   Chiropractic radiation protection officer   Chiropractic facility 

  4.   Chiropodic radiation protection officer   Chiropody facility R.R.O. 1990, Reg. 543, Table 2. TABLE 3   Dental Facility Item   Column 1   Test or Procedure   Column 2   Frequency 

  1.   Photographic quality control   Every operational day 

  2.   Patient entrance exposure measurements   Every twelve months and upon alteration or servicing of the machine 

  3.   Collimation   Every twelve months and upon alteration of servicing of the machine 

  4.   Half-value layer   Every twelve months and upon alteration or servicing of the machine R.R.O. 1990, Reg. 543, Table 3. TABLE 4   Chiropodic Facility Item   Column 1   Test or Procedure   Column 2   Frequency 

  1.   Photographic quality control   Every operational day 

  2.   Patient entrance exposure measurements   Every twenty-four months and upon alteration or servicing of the machine 

  3.   Collimation   Every twelve months and upon alteration or servicing of the machine 

  4.   Half-value layer   Every twelve months and upon alteration or servicing of the machine R.R.O. 1990, Reg. 543, Table 4. TABLE 5   Medical and Chiropractic Facilities Item   Column 1   Test or Procedure   Column 2   Frequency 

  1.   Photographic quality control   Every operational day 

  2.   Patient entrance exposure measurements and, for every mammographic x-ray machine, calculation of mean glandular breast dose   Every six months and upon alteration or servicing of the machine 

  3.   Collimation   Every six months and upon alteration or servicing of the machine 

  4.   Half-value layer   Every six months and upon alteration or servicing of the machine 

  5.   Phototiming parameters including operation of back-up timer   Every six months 

  6.   Fluoroscopic parameters, including, (a)  maximum patient entrance exposure rate (b)  resolution (c)  limit timer (d)  automatic brightness control   Every six months and upon servicing of the machine 

  7.   Tomographic parameters, including fulcrum accuracy, thickness of cut and mechanical stability   Every six months R.R.O. 1990, Reg. 543, Table 5; O. Reg. 663/00, s. 3. TABLE 6 Item   Column 1   Projection   Column 2   Patient Thickness (standard for test purposes)   Column 3   Source-to-image distance   Column 4   Maximum entrance exposure (exposures expressed as exposure in air without backscatter) expressed in milliroentgens 

  1.   Abdomen AP   23 cm   100 cm   450 

  2.   Cervical Spine AP   13 cm   100 cm   120 

  3.   Chest PA   23 cm   180 cm   20 

  4.   Foot (Dorso-Plantar) Direct Film   8 cm   100 cm   200 

  5.   Full Spine   23 cm   180 cm   250 

  6.   Intravenous Pyelogram   23 cm   100 cm   500 

  7.   Lumbar Spine AP   23 cm   100 cm   500 

  8.   Lumbar Spine Lateral   32 cm   100 cm   2,000 

  9.   Revoked:  O. Reg. 663/00, s. 4. 

  10.   Skull Lateral   15 cm   100 cm   170 

  11.   Thoracic Spine AP   23 cm   100 cm   400 R.R.O. 1990, Reg. 543, Table 6; O. Reg. 663/00, s. 4. TABLE 7 Item   Column 1   Projection   Column 2   Peak Kilovoltage   Column 3   Maximum entrance exposure expressed in milliroentgens 

  1.   Posterior Bitewings   50   550 

  2.   Posterior Bitewings   60   475 

  3.   Posterior Bitewings   70   360 

  4.   Posterior Bitewings   80   280 

  5.   Posterior Bitewings   90   220 R.R.O. 1990, Reg. 543, Table 7. TABLE 8 Item   Column 1   Measured Potential (kilovolts peak)   Column 2   Minimum Half-value Layer (millimetres of aluminum) 

  1.   30   0.3 

  2.   40   0.4 

  3.   49   0.5 

  4.   50   1.2 

  5.   60   1.3 

  6.   70   1.5 

  7.   71   2.1 

  8.   80   2.3 

  9.   90   2.5 

  10.   100   2.7 

  11.   110   3.0 

  12.   120   3.2 

  13.   130   3.5 

  14.   140   3.8 

  15.   150   4.1 R.R.O. 1990, Reg. 543, Table 8.  Français