Project #45764 - Health and Safety in Radiological Practice

 

 

 

 

 

Hello guys, please do not bid unless you can deliver correct and accurate answers.

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Please hand in one Word document containing your responses with page breaks to split the responses as required.  If you wish, to support your answers, you may insert figures into the document.

 

Question 1. Health Physicists’ written response to concerned patient

A hospital patient with a scheduled lumbar spine CT scan had recently come across the attached Newsweek article on the internet.  The patient expressed concern prior to the scheduled CT scan about the potential negative effects of radiation from the scheduled CT scan.  As a result, you, the hospital health physicist, have been contacted to write a formal response to the concerned patient prior to the CT scan.  You should be formal, well-written, and most importantly include relevant information which will put the patient at ease.  You should use the internet or lecture slides to find relevant UK diagnostic radiology regulations which prevent radiation accidents from occurring.  You should also compare the radiation energies referred to in the Newsweek article to those used in CT scans.  Risk of negative effects of radiation should be addressed, in a quantitative manner where possible.  Your answer to this question should be submitted in the format of a letter written from a hospital health physicist to the patient. 

Question 2.  Radiation Protection Advisor’s X-ray lab setup recommendations

A new X-ray imaging laboratory is going to be installed in the room shown on the attached sketch.  It is a vertical bucky set-up, for research purposes only, so no large table for patient supine positioning.  The X-ray tube is at the top of the structure and the image receptor is at the bottom, with a moveable table in between for test objects and phantoms to be imaged.  On the sketch attached, you will see a square with the vertical X-ray system in it.  Your assignment is to decide the most suitable place in the diagram to place the square.  In other words, from a radiation protection point of view, what is best place to set up the X-ray system in this existing room (i.e. not build-for-purpose as an X-ray lab)?  There is an office above the room and below is a storage room where people come in and out of but do not remain for long periods of time.  Please turn in your answer in the format of a letter:  You are the Radiation Protection Advisor who has analysed the blueprint and is offering advice to the builders about how to arrange the room.  You should give reasons for your decisions, considering primary and scattered radiation and their potential effects on those working in or around the building.  You may use sources of information found on the internet but should be able to think through the problem considering the properties of X-ray radiation. 

Question 3.  Dose calculation for diagnostic procedure exposure to a patient

A large adult patient undergoes a complex cardiac catheter procedure which is guided live by X-rays using a dynamic interventional X-ray imaging (i.e. fluoroscopy) system.  During this procedure the X-ray beam enters mainly through one area of skin on the patient’s back.  The DAP (dose area product) at the end of the procedure is reported by the X-ray system to be 700 Gy cm2.  This is over the “flag-raising” limit, and so the head radiographer reports it to the medical physics department.  You are the medical physicist given the job of performing a dose calculation to determine whether or not the patient is likely to suffer from a deterministic effect of radiation after the procedure.  The patient may require a follow-up check.  Calculate the entrance surface dose (ESD) at the patient’s skin, and draw your conclusion from the result.  You should assume that the back scatter factor for this patient is 0.3 (the dose at the entrance surface goes up by 30% due to scatter off the surface).  The area of the X-ray beam was on average 20 cm x 20 cm.  Provide your response as a formal internal hospital report, summarising the given information about the patient, the calculation (in detail), and the conclusions drawn from the calculation including advise for any necessary action to take regarding this patient.

Subject Medicine
Due By (Pacific Time) 11/04/2014 04:00 am
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