Table of Contents
- 1 How can a radiographer reduce scattered radiation?
- 2 How can scatter radiation be prevented?
- 3 Which device is used to improve radiographic quality by reducing scattered radiation?
- 4 What are the three major factors that produces scatter radiation?
- 5 How is scattered radiation produced?
- 6 How is scatter radiation produced?
- 7 Which device is used to remove the scattered radiation?
- 8 What are the factors affecting scattered radiation?
How can a radiographer reduce scattered radiation?
To reduce scatter, possible methods are smaller fields-of-view, larger air gaps and the use of an anti-scatter grid. Smaller fields of view may not be acceptable and scanned-beam radiography is not practical for real-time imaging.
How can scatter radiation be prevented?
Time: Minimizing the time of radiation exposure will reduce the radiation dose. Distance: Increasing the distance between the patient and the radiation source will reduce exposure by the distance squared. Shielding: Lead or lead-equivalent shielding for X-rays and gamma rays can block and reduce radiation exposure.
What can the radiographer do to protect the patient from off focus radiation?
Collimation: Collimation restricts the x-ray beam to the area of interest using lead shutters within the x-ray tube. A secondary beneficial effect of collimation is reduction of off focus radiation making it to the film.
Which device is used to improve radiographic quality by reducing scattered radiation?
Radiographic grids are used to improve radiographic image quality by absorbing scatter radiation that exits the patient, reducing the amount of scatter reaching the IR.
What are the three major factors that produces scatter radiation?
Three primary factors influence the relative intensity of scatter radiation that reaches the image receptor: kVp, field size, and patient thickness. As x-ray energy is increased, the absolute number of Compton interactions decreases, but the number of photoelectric interactions decreases much more rapidly.
What causes scatter in radiography?
Scatter radiation is a type of secondary radiation that occurs when the beam intercepts an object, causing the X-rays to be scattered.
How is scattered radiation produced?
How is scatter radiation produced?
Scatter radiation is generated in the patient when an x-ray beam strikes the patient. The maximum scatter radiation occurs perpendicular to the x-ray beam. In other words, if the x-ray unit is above the patient, the highest scatter radiation at a set distance from the patient will be out to the side of the patient.
How does scatter affect image quality?
Scattered radiation reduces the level of contrast of a hidden X ray image, introduces additional quantum noise, and decreases image sharpness and increases background heterogeneity.
Which device is used to remove the scattered radiation?
An anti-scatter grid is usually used to reduce the scattered radiation detected, as in conventional screen/film or digital radiography.
What are the factors affecting scattered radiation?
Four primary factors directly affect the quantity of scatter radiation fog on the radiograph (Box 9-1): volume of tissue, kVp, density of the matter, and field size.