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a) Explain what is meant by the expression ‘barium meal’ and give three examples of organs that it can be used to image.

18 / 01 / 2019 Physics

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Q2) Explain the safety procedures followed when using alpha, beta and gamma radiation and X- rays. 
 
Q3 When an X-ray image is produced of certain parts of the body, imaging contrast enhancement such as ‘barium meals’ may be used.  
a) Explain what is meant by the expression ‘barium meal’ and give three examples of organs that it can be used to image.

b) Explain the need for using a barium meal for the examples stated in (part a) above. 

c) Select one of the examples given in ‘part a’ and explain how barium meal is used to produce the image for this organ. Support your answer with a diagram.

d) Explain how gamma rays are used in imaging. 

e) Brachytherapy is a medical treatment where sealed radioisotopes (source) are placed inside the body next to a cancer for a period of time.  The main radiation source that is used to treat head and breast cancers is Iridium- 192. Explain the use of internal sources of radiation in treatment procedures (3.3).

Q4a) With the aid of a diagram, outline the method of generation of Technetium-99 and its main use.

Q4b) Describe the use of Iodine-131 in thyroid investigations. 

Q6a) Explain what is meant by the term ‘ultrasound’. 

b)  Explain with the aid of diagrams the difference between an A and a B scan.

c) Describe the use of ultrasound in the treatment of kidney stones.

d) Describe the use of ultrasound in monitoring foetal development. 

e) Explain what is meant by ‘Doppler ultrasound’ and how this method is used in medical treatment to measure blood flow rate. 


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