What is the purpose of a technique chart?
The technique chart is an invaluable resource for a radiographer. Its purpose is to provide a consistent method of choosing the proper exposure factors to create a diagnostic radiograph.
What are the different radiographic techniques?
There are two types of techniques used for periapical radiographs: bisecting angle, and paralleling. The bisecting technique may have to be used for patients unable to accommodate the film positioning device used in the paralleling technique. These patients may include adults with low palatal vaults and children.
What is the 15% rule radiology?
The 15% rule states that changing the kVp by 15% has the same effect as doubling the mAs, or reducing the mAs by 50%; for example, increasing the kVp from 82 to 94 (15%) produces the same exposure to the IR as increasing the mAs from 10 to 20. A 15% increase in kVp has the same effect as doubling the mAs.
What is Santes rule?
What is Sante’s Rule? Calculation for determining approximate kVp for given exposure, based on patient measurement in cm and grid being used. Used as a starting point for new technique chart.
What are technique charts?
Technique charts are tables that contain settings for selection on the x-ray control for a specific anatomical part. These factors control the amount of radiation delivered to the patient and to the film.
What factors influence a technique chart?
What factors can influence a technique chart? Speed of screens, age of screens, speed of film, source-image distance (SID), amount of beam filtration, temperature and time of film processing and type of grid.
What is diagnostic radiography?
What’s Diagnostic Radiography? Diagnostic Radiography, also known as medical imaging, is the use of radiation to produce images to help diagnose and treat disease and injury. Radiographers use some of the most advanced technologies to look inside a patient’s body.
What is mA and kVp?
The three main components of any x-ray exposure are kVp, mA, and time. * kVp: the power and strength of the x-ray beam (quality of the x-rays). * mAs: the number of x-ray photons produced by the x-ray tube at the setting selected (quantity of x-rays). * time: how long the exposure lasts. Understanding Technique.
How is kVp calculated?
(measured thickness in centimetres x 2) + 40 = initial kVp For example, if your dog measures 14cm thickness at the 12th rib, the initial kVp should be 68. If your X-ray machine cannot generate the exact kVp required, select the nearest available setting to the one calculated.