Imaging techniques

Question 1

What are the types of plain radiographs

Answer 1

• Intraoral
• Extraoral non-tomographic
• Extraoral tomogram

Question 2

What are the types of intraoral radiographs:

Answer 2

• Periapical
• Bitewing
• Occlusal

Question 3

What are intraoral radiographs used for?

Answer 3

• Caries diagnosis
• PA pathology
• Bone pathology
• Salivary stones

Question 4

What are extraoral non-tomographic radiographs used for

Answer 4

• Orthognathic
• trauma
• sinus views

Question 5

What is an example of extraoral-tomogram

Answer 5

• OPT

Question 6

What are extra-oral tomogram used for?

Answer 6

• PA pathology
• Bone pathology
• Nerves
• Condyles
• Trauma
• Coronoid
• Sinusitis

Question 7

What is the benefit of the CT scan rotating around the object

Answer 7

• You can get an image from multiple planes

Question 8

What are CT scans used for

Answer 8

• Calcified tissues
• Calcified bones
• Facial trauma
• Infections
• Abscess
• Gas in the tissues
• Lymph nodes
• Salivary glands
• Abdomen
• Pelvis

Question 9

What are Cone bean CT scans used for

Answer 9

• Implant planning
• Positions of impaction
• Foreign body
• Nerve injury
• Predict risk of nerve injury

Question 10

What are MRI used for

Answer 10

• Blood vessels
• Organs
• Muscles
• Lymph nodes

Question 11

How do ultrasound generate an image

Answer 11

Ultrasound use ultrasound emissions which are transmitted into the tissue and sound waves bounce back from the tissues – depending on the time taken for the signal to come back to the detector that tells us how far the structure is from the detector and can create an image

Question 12

Is ultrsound better for hard tissue or soft tissue

Answer 12

• Soft tissue as in hard tissue the sound waves would reflect off the hard tissue and not show structures behind the hard structure

Question 13

What structure are ultrasounds good at taking images of?

Answer 13

• Lymph nodes in neck

Question 14

How can ultrasounds differentiate between arteries and veins

Answer 14

• Doppler imaging can be used in the ultrasound to detect the speed of fluid moving through the vessel
• Fast flow would suggest arteries and slow flow would suggest veins

Question 15

What is fine needle aspiration cytology FNAC

Answer 15

• Is a form of biopsy
• Where u place a needle into the lymph node and take up the some of the cells in the lymph node and then send that to labs for a biopsy

Question 16

What is Ultrasound guided core biopsy

Answer 16

• A sharp metal tube is put through the lesion and another metal tube slides down and cuts off the tissue
• tissue is then sent off for biopsy

Question 17

How do PET scans work

Answer 17

Works by injecting radioactive isotope into the patient – the radioactive isotope is a radioactive glucose that is taken up by metabolically active tissues

Question 18

What do we need to make the pt aware of following a PET scan

Answer 18

Pt is radioactive for few hours

Question 19

What is PET-CT most commonly used for

Answer 19

• Diagnosing cancer especially head and neck cancer