From vet tech: The grid is used when x-raying body parts that are larger (thicker). Briefly...

From vet tech:

The grid is used when x-raying body parts that are larger (thicker). Briefly describe why a grid is used in these circumstances.

Expert Solution

The basic purpose of x-ray grid use is to enhance the contrast and quality of the medial image by removing the scatter radiation. Grids are in many sizes and shapes to match various radiographic and fluoroscopic receptors. Grids are placed between the patient and the x-ray film to reduce the scattered radiation reaching the detector (produced mainly by the Compton effect) and thus improve image contrast. Grids improve contrast by larger factors when the proportion of scattered radiation in the beam is higher. The contrast improvement factor is the ratio of the contrast when a specific grid is used compared with the contrast without the grid. Grids made of parallel strips of high attenuating material such as lead with an interspace filled with low attenuating material such as carbon fiber or organic spacer. The strips can be orientated either linear or crossed in their longitudinal axis. As scattered radiation is increased in "thicker" patients and at larger field sizes, grids are useful in such scenarios to improve image contrast.

Types of grids

1) focussed grids (most grids): strips are slightly angled so that they focus in space so must be used at specified focal distances
2) parallel grid: used for short fields or long distances
3) moving grids (also known as Potter-Bucky or reciprocating grids): eliminates the fine grid lines that may appear on the image when focussed or parallel grids are used; cannot be used for portable films

gladiator answered 1 year ago

Are there any parts of the human body that get oxygen directly from the air and not from the blood?

Mcq choose one option need all questions answered 2.The relationship grid is used when: I have...

Mcq choose one option need all questions answered 2.The relationship grid is used when: I have no clue When there is no quantifiable data None of these We have no idea what to put close to other departments When there is quantifiable data When we want to separate items 3.Efficiency can never be over 100%. a. True b. False 4. Scheduling is usually the last step in the production process. a. True b. False 5. 100% utilization is a good...

Briefly describe the process by which the body strips electrons from food molecules (use a polysaccharide...

Briefly describe the process by which the body strips electrons from food molecules (use a polysaccharide made up of glucose monomers as an example) and uses them to power the electron transport chain.

The resistance of the body varies from approximately 500 kΩ (when it is very dry) to...

The resistance of the body varies from approximately 500 kΩ (when it is very dry) to about 1.00kΩ (when it is wet). The maximum safe current is about 5.00 mA. At 10.0mA or above, muscle contractions can occur that may be fatal.a)What is the largest potential difference that a person can safely touch if his body is wet?b)Is this result within the range of common household voltages?

Briefly describe how a Design of Experiments methodology can be used when testing a new pump...

Briefly describe how a Design of Experiments methodology can be used when testing a new pump design that has three variables (number of impeller blades, channel depth, outlet diameter). Why would a factorial design of experiments be better than optimizing each variable independently?

Aluminum, iron and magnesium are used to manufacture certain metal parts.The quantity of parts produced from...

Aluminum, iron and magnesium are used to manufacture certain metal parts.The quantity of parts produced from x tons of aluminum y tons of iron and z tons of magnesium is Q (x, y, z) = xyz. Aluminum is $ 800 per ton, iron is $ 400 per ton, and magnesium is $ 600 per ton. use the Lagrange multiplier method to determine the number of tons of each material that must be used to manufacture 5000 metal parts at the...

When we consume excessive carbohydrates and protein from diet, the body store them in the adipose...

When we consume excessive carbohydrates and protein from diet, the body store them in the adipose tissue in the form of triglycerides. Explain the key steps in the metabolic pathways that lead to triglyceride formation from glucose and amino acids.

I used this code for parts a-d: x=runif(1e6,1,5) mean(x) var(x) hist(x,main="Histogram of x",xlab="x",ylab="f(x)",border="blue",col="green",freq=F) Write R code...

I used this code for parts a-d: x=runif(1e6,1,5) mean(x) var(x) hist(x,main="Histogram of x",xlab="x",ylab="f(x)",border="blue",col="green",freq=F) Write R code that does the following: Let Xi be a random variable uniformly distributed between 1 and 5. (a) Find E[Xi ] and Var(Xi). (b) Generate 1000000 samples from a random variable X that has a uniform density on [1,5]. x=runif(1e6,1,5) (c) Create a histogram of the distribution. hist(x,freq=F) Explain the shape of histogram. Is it consistent with the uniformly distributied rv between 1 and 5?...

When one action potential is traveling along an unmyelinated axon from cell body side and another...

When one action potential is traveling along an unmyelinated axon from cell body side and another action potential is traveling along the axon from synaptic terminal side, these two action potentials are going to collide with each other at the center of the axon. What is going to happen to these action potentials after the collision?

briefly describe how PCR and gel electrophoresis can be used to analyse DNA samples from crime...

briefly describe how PCR and gel electrophoresis can be used to analyse DNA samples from crime scenes.

Question