What factors affect radiographic detail?
Factors Affecting Radiographic Density. Greater radiographic density may be produced by increasing (1) the total number of x-rays that reach the film, (2) the penetrating power of the x-rays, (3) the developing time, or (4) the temperature of the developer.
What could have caused the radiographic image to be distorted?
Distortion also occurs when the X-ray beam is angled across the object being X-rayed. The focus to image receptor (SID; see p. 91) should be as long as possible and the distance between the patient and the image receptor (object–film distance, OFD) as short as possible.
What is noise in radiography?
Radiographic noise is a fluctuation in optical density on radiographic or mammographic images, often as a result of low radiation dose. See also Electronic Noise. Tomography. Tomography is imaging by sections or sectioning to obtain images of slices through objects like the human body.
What are the four primary factors of radiographic quality?
The quantity and quality of the x-ray beam are controlled by four prime factors. These factors are under the direct control of the limited operator. The prime factors of exposure are milliamperage (mA), exposure time (S), kVp, and SID.
What is radiographic image quality?
Radiographic Quality Radiographic Quality refers to the fidelity with which the anatomic structures being examined are imaged on the film.
What are the characteristics of radiographic image?
Radiographic images are typically described by their scale of contrast or the range of densities visible. A radiograph with few densities but great differences among them is said to have high contrast. This is also described as short-scale contrast (Figure 9-8).
What is shape distortion?
Shape distortion is sometimes referred to as “true distortion”. It’s defined as the misrepresentation of the shape (length or width) of an object. This is caused by beam/part alignment. The two different types of shape distortion are: Elongation and Foreshortening.
What are the factors that produces noise in radiology?
The quantum noise (quantum mottle), structural noise and electronic noises are the main sources. Noise in plain radiography can be decreased by increasing the mAs which increases the number of photons reaching the detector over the duration of the exposure.
What is size distortion in radiography?
This refers to a variation in size or shape of the image in comparison to the object in represents. Size distortion is always in the form of magnification, and all radiographic images are magnified to some degree. The factors that affect magnification are the OID and the SID. The angulation of the diverging xray that define the edges
What are the causes of radiographic distortion?
Several factors contribute to radiographic distortion whereby the anatomy examined is misrepresenting on the plain radiograph . The x-ray beam originates from a point source within the x-ray tube. It is due to this point source nature that x-ray beams will all possess ‘beam divergence’.
What are the factors that affect the magnification of radiographic images?
Size distortion is always in the form of magnification, and all radiographic images are magnified to some degree. The factors that affect magnification are the OID and the SID. The angulation of the diverging xray that define the edges of a subject affects the degree of magnification.
How do you prevent magnification and distortion on a radiograph?
To prevent magnification and distortion on a radiograph the anatomy must be near the receptor, and far away from the x ray source, and the beam (for most examinations) should be at 90 degrees to the anatomy and receptor, not at an angle. 8 clever moves when you have $1,000 in the bank.