Question

1. The molecular composition of the human body is 80% _______ which explains why formation of hydroxyl radicals are so important to producing radiation effects in the body.

2. Name the four “generations” of technology that computed tomographic (CT) imaging systems have undergone. Using your imagination, what do you think the next or “fifth” generation of CT imaging systems will be like? and indicate briefly what distinguished each generation from the others.

3. Give two examples of poor image quality in SPECT or PET nuclear medical imaging and briefly describe what might be done to control quality of images from each example.

4. What is “interventional” radiology, how did it begin, what routine procedures are conducted currently in an interventional radiology suite and what sort of specialized nuclear medical technology skills might be needed best support the growing demand for this form of medical practice?

Answer 1

1. The molecular composition of the human body is 80% of water which explains why formation of hydroxyl radicals are so important to producing radiation effects in the body.

2. Four generations of CT scn are :-

First-Generatioin Scanners

Pencil beam. Single detector. The tube/detector assembly moved across the patient, then rotated by 1deg. Total scan time about 5 minutes per image

Second-Generation Scanners

Fan beam. Multiple detectors in a straight line. the tube/detector assembly moved across the patient, then rotated by 5 deg. Total scan time about 20 seconds per image

Third-Generation Scanner

*Fan beam

*Multiple detectors along an arc

*The tube/detector assembley rotates around the patient

*Total scan time faster than 1 second per image

Fourth-Generation Scanners

*Fan Beam

*Multiple detectors encircle patient but do not rotate

*Only the tube rotates around the patient

*Total scan time faster than 1 seond per image

4. Interventional radiology are the minimum invasive radiology procedure which uses angiography techniques to diagnose a disease condition.

Interventional Radiology began in1930s with angiography

Purpose of Interventional Radiology :-

minimally invasive radiologic procedures that use angiographic techniques to diagnose disease

Angiography :-

using needles and contrast media to enter and highlight arteries

What are some other interventional therapeutic precedes conducted in and through vessels

Angioplasty

thromolysis

embolization

vascular stents

biopsy

#. Skills needed by a radiologist are :-

- communication skills

- medical and anatomical skills

- mechanical skills