What are the types of image-forming x-rays that exit the patient?

09/02/2020 Off By admin

What are the types of image-forming x-rays that exit the patient?

X-rays that exit from the patient are remnant x- rays and those that exit and interact with the image receptor are called image-forming x- rays. Some x-rays interact with the patient and are scattered away from the image receptor (a). Others interact with the patient and are absorbed (b).

Which are image-forming x-rays?

An x-ray image is formed by the different attenuations of the x-ray beam within a patient’s body. Objects with increased attenuation produce shadows. The image contrast produced by an object depends on its attenuation of the x-ray beam. Generally increased penetration through an object decreases contrast.

Which 3 factors influence the intensity of scatter in the image-forming beam?

X-rays of types c and d are called image-forming x-rays. Three primary factors influence the relative intensity of scatter radiation that reaches the image receptor: kVp, field size, and patient thickness.

What is the most commonly used beam restricting device?

Collimator’s: This is the most frequently used type of beam limiting device. Collimator’s consist of two sets of adjustable lead shutters inside the x-ray housing unit.

What is the beam of x-rays called after it passes through the patient?

Primary – The beam of photons that exit the x-ray tube and hit the patient’s body , the amount of photons lessens as they pass through matter. Remnant- the resulting beam that exits from the patient.

What are the factors affecting image quality?

Acquisition geometry-Image acquisition geometric factors affecting image quality include a source to image receptor distance, orientation, the amount of magnification, and size of the focal spot.

How is the image made in an x-ray?

X-rays are a form of electromagnetic radiation, similar to visible light. If x-rays travelling through the body also pass through an x-ray detector on the other side of the patient, an image will be formed that represents the “shadows” formed by the objects inside the body.

What are X-rays used for?

X-rays can be used to examine most areas of the body. They’re mainly used to look at the bones and joints, although they’re sometimes used to detect problems affecting soft tissue, such as internal organs. Problems that may be detected during an X-ray include: bone fractures and breaks.

What are the three factors that affect scatter radiation?

Factors Affecting Quantity of Scatter Radiation Fog 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.

Which factor improves radiographic image quality when it is increased?

chapter 10 thru 18

Question Answer
Radiographic image quality is improved when the _____ is increased. source image distance
Patient thickness affects image quality by affecting _____. magnification radiographic contrast focal spot blur
The technologist primarily controls radiographic contrast by varying the _____. kilovoltage

What is the greatest source of scatter?


Question Answer
the greatest source of scatter during a radiographic exam is the patient
the half-value layer is typically expressed in Al/Eq
the higher the kVp, the lower the patient dose
the interaction that produces scatter radiation is called___interaction compton

What increases as collimation increases?

As collimation increases, the quantity of scatter radiation decreases, and radiographic contrast increases; as collimation decreases, the quantity of scatter radiation increases, and radiographic contrast decreases.