What is kVp and mAs in radiology?

What is kVp and mAs in radiology?

* 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. kVp stands for kilovoltage peak.

What order should you obtain measurements from a dial caliper?

There are 4 measurements you can make with a dial caliper and those are outside diameter/object thickness, inside diameter/space width, step distance, and hole depth.

How the exposure factors kVp and mAs may be adjusted to maintain the same radiation intensity?

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.

Which measuring gauge needs to be set up adjusted to a fixed dimension before use?

A dial bore gauge is to be set to a dimension before use as it the amount of bore being measured and this measurement varies from the pre-set dimension.

What are the effects of kVp and mAs on image quality?

The first experiment showed that, when the film density is kept constant, the higher the kVp, the lower the resolution and image contrast percentage; also, the higher the mAs, the higher the resolution and image contrast percentage.

Why kVp is primary control for contrast?

This kVp is predetermined based on the penetration needed for the part and the contrast required. Often the physician may request that an additional radiograph be taken at a different contrast level in order to see the anatomy differently. Therefore kVp is the primary controller of radiographic contrast.

What are the four types of dial caliper measurements?

Your caliper can take four kinds of readings: outside, inside, depth, and step. Any caliper, whether it is a vernier caliper, dial caliper, or electronic digital caliper, can take these measurements.

What are the 3 ways a dial caliper can be used to measure?

All calipers – digital/electronic caliper, dial caliper and Vernier caliper – can take the same measurements: inside, outside, depth and step.

How does Sid affect image quality?

The source image receptor distance (SID), is the distance of the tube from the image receptor, affecting magnification. The greater the SID, the less magnification the image will suffer.

How do you calibrate a micrometer procedure?

Micrometer Calibration

1. Look at the frame for any signs of damage.
2. Make sure the spindle and anvil faces are flat, free of pinholes, and are clean.
3. Check to see if the spindle feels smooth while moving the micrometer from 0 – 25ml.
4. Make any repairs that are needed to be done before proceeding.

What is a telescopic gauge commonly used to measure?

Telescoping gauges are indirect measuring devices used to measure the internal diameter of a bore, hole, groove, slot, etc. This T-shaped tool consists of a handle, two telescopic rods and a locking screw.

What is the effect of mAs?

When do you close the jaws on a caliper?

Dry and clean the measuring surfaces of the “jaws” then fully close the caliper. If the needle on the dial on your caliper (display on a digital caliper) returns to “0” you can begin to take your measurement. During the measuring process do not touch the measuring surface of the object being measured and the measuring surfaces of your caliper.

How to take an outside measurement with a caliper?

To take an outside measurement open the large jaws of your caliper and holding the item to be measured in your left hand close the jaws on the object you are measuring. Make sure the jaws are “flat” on or around the object. If the jaws are tilted in any way you will not obtain an accurate measurement.

How many teeth are in a dial caliper?

The construction of the dial caliper is a dial that is fixed to a moveable jaw and rides along the tools bar or slide, meshing with a toothed rack. The rack is typically ground so that each tooth is equal to .025” or one quarter of the dial resolution, and four teeth equal .100”.

How often should a caliper be checked for wear?

Check the caliper often for wear, as well as for burrs and scratches on the jaws and contacting surfaces. A simple way to do this is to pass a master disc along the jaws while inspecting for wear or taper. A caliper should be calibrated at least once a year—more often when use is heavy or there are multiple users of the same instrument.