Guide to Panoramic Radiography Techniques
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This document discusses panoramic radiography and the reverse panoramic technique. It provides a brief history of panoramic radiography and describes the principles of how the technique works using reciprocal movement of the x-ray source and image receptor while keeping the patient stationary. The document outlines the procedure for taking a reverse panoramic radiograph and notes that it allows for a clear less distorted view of the lateral aspect of the condyle. However, it requires critical patient positioning. The document concludes that the reverse technique exposes patients to less radiation dose than the standard panoramic technique, especially in areas like the eyes, TMJ and neck.
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Guide to Panoramic Radiography Techniques
- 1. INDIAN DENTAL ACADEMY Leader in continuing Dental Education www.indiandentalacademy.com
- 3. Panorama – an unobstructed region in any direction www.indiandentalacademy.com
- 4. history described by Numata & Paatero Hudson & Blackman first orthopantomography in 1961 www.indiandentalacademy.com
- 5. Principle Reciprocal movement of x ray source & image receptor Patient remains stationary Plane of acceptable detail www.indiandentalacademy.com
- 6. Focal trough / corridor www.indiandentalacademy.com
- 7. Temperomandibular Joint Panoramic radiograph TMJ Tomogramwww.indiandentalacademy.com
- 10. procedure Rotograph 230 - 1992 Chin rest removed www.indiandentalacademy.com
- 11. procedure….. Explain the procedure Remove the eyeglasses, earrings Sit / stand in reverse position Mid saggital plane perpendicular Frankfort line parallel Mouth open / closed www.indiandentalacademy.com
- 16. To view the lateral aspect of the condyle Patient positioning is critical Speed is reduced Image layer is slightly closer to the centre of rotation Restricted mouth opening www.indiandentalacademy.com
- 17. errors • Patient placed more anteriorly www.indiandentalacademy.com
- 18. errors….. • tilting of the head www.indiandentalacademy.com
- 19. Advantages Clear and less distorted view Simplicity Easy quality control Trismus snd uncooperative patient Limitations Patient positioning Exposure to eye www.indiandentalacademy.com
- 20. Comparison of dosage in standard and reverse positions using a Rando phantom Sites Reverse cGy Williams Standard cGy Williams Left eye 0.003 0.002 Right eye 0.003 0.002 Left external TMJ 0.010 0.007 Right External TMJ 0.007 0.006 Left Mastoid 0.006 0.006 Right mastoid 0.004 0.005 Back neck 0.002 0.008 Centre tongue 0.035 0,013 Williams F J, Hudson F R, Markus A F, Rotational panoramic radiography – a comparison of radiation doses in the standard and reverse position www.indiandentalacademy.com