What is the harp act?
Arts Radiation Protection Act The HARP legislation governs the use of X-rays for the irradiation of human beings in the province of Ontario. Regulation 543 under the HARP Act, sets out the X-Ray Safety Code, and sets parameters for the operation of X-ray machines and the qualifications of individuals operating them.
What is the safety code 30?
2. Principal Objectives. This Safety Code is concerned with the protection of all individuals who may be exposed to ionizing radiation from dental X-ray equipment.
What is a step wedge test?
Step Wedges are used in Radiology Quality Control Programs to test x-ray machine sensors and phosphor storage plates. Having a Radiology Quality Assurance Program is an important part of radiology compliance.
What is the purpose of a step wedge radiograph?
A radiographic exposure made with a step-wedge is used to determine the amount of radiation reaching the image receptor through each of the increments. Measurements of radiographic image density may be used to evaluate the intensity and penetrative power of the radiation.
What is penny test in radiology?
Penny test: Can be done monthly to evaluate for fogging caused by inappropriate safe lighting conditions: Open the packet of an exposed film and place the test film in the area where film are unwrapped and clipped on the hanger Place a penny on the film and leave it in this position- approximate time required …
What is stepped wedge cluster Randomised trial?
The stepped wedge cluster randomised trial is a novel research study design that is increasingly being used in the evaluation of service delivery type interventions. The design involves random and sequential crossover of clusters from control to intervention until all clusters are exposed.
What is cervical burnout?
Cervical burnout appears as a radiolucent band around the necks of teeth and is more pronounced at the proximal edges. The X-ray photons overpenetrate or burn out the thinner tooth edge and create the radiolucent area that mimics cervical caries [26] (Figure 1).
What is the slob rule?
The SLOB rule is an acronym for Same Lingual Opposite Buccal. The premise is that one radiograph is taken straight on at a 90 degree angle to the tooth and a second radiograph is taken with the tubehead shifted either mesially or distally.
Which type of caries occurs under an existing restoration?
Secondary or Recurrent Caries (Figure 5) – Includes caries seen adjacent to or beneath an existing restoration.
How do you prevent a cone cut?
To correct a cone-cut error, the beam should be re-centered toward the area of non-exposure. Improper assembly of receptor holding devices can also cause cone-cuts. When assembling these devices, make certain that the entire receptor can be seen while looking through the indicator ring.
What causes a cone cut?
Cone cut may be caused by various reasons. The most common being the image receptor is not in line with the position indicating device (PID)/radiographic cone. Hence, the collimator which reduces the size and shape or cross-sectional area of the X-ray beam doesn’t completely exposes the film resulting in cone cut.
What is bitewing technique?
Bitewing Technique The bitewing radiographic image is used to examine the interproximal surfaces of the teeth and is particularly useful for the detection of dental caries and alveolar bone levels. The receptor is placed into the mouth parallel to the crowns of the maxillary and mandibular posterior teeth.
What is Cone cut in radiograph?
(kōn’kŭt) Manifestation visible in a dental radiograph in which a portion of the image is missing due to the radiation beam’s having been blocked by improper aim of the cone or position-indicating device (q.v.).
What is Phalangioma?
The term phalangioma was used by Dr. David F Mitchell. It refers to the image of phalanx or fingers (plural -phalanges) appearing in the film. Cause: Phalangioma occurs when the patient holds the film in the mouth in an incorrect way which results in exposing the image of fingers on the radiograph.
Which is not true of duplicating film is emulsion?
Which is not true of duplicating film’s emulsion? The emulsion is dull, only on one side, and exposed by light, not x-rays. The recommended distance between the safelight and where the films are unwrapped is: The recommended distance between the safelight and where the films are unwrapped is 4 feet.
What is the advantage of duplicating film?
The exposure time is the same, the patient receives no more or less radiation and the density and detail of the 2 films is the same to the naked eye. One can purchase duplicating film, the same size as the number 2 periapical radiographs.
What is the process for duplicating radiographs?
12) Describe the process for duplicating radiographs. -To duplicate a film it must be done in a darkroom setting and the duplicating film can never be exposed to x-rays. The duplicating machine produces white light to expose the film and the longer the duplicating film is exposed tolight, the lighter it will become.
What is the cause of white spots on a processed film?
Films that are subject to a sudden temperature change in processing solutions demonstrate reticulation of emulsion; the film appears cracked. Fixer spots result from fixer solution being splashed onto the unprocessed film.