Other Imaging Modalities 2

Question 1

What techniques are used for bony imaging?

Answer 1

• CBCT or CT
• MRI for changes in bone marrow

Question 2

what is CBCT?

Answer 2

• low dose multi-planar imaging
• allows for 3D image
• good for bony imaging however poor for soft tissues

Question 3

what are the differences between CBCT vs CT?

Answer 3

CBCT:
- Cone shaped beam
- low dose
- poor soft tissue contrast
- radiographic contrast not required
- patient sitting upright/standing

CT:
- Fan shaped beam
- high dose
- good soft tissue contrast (windowing)
- radiographic contrast can be used if indicated
- Patient lying horizontal

Question 4

what are some diseases that CBCT & CT scans can help image?

Answer 4

• Osteoradionecrosis/MRONJ
• Osteomyelitis
• Odontogenic lesions

Question 5

to check for internal derangement of TMJ (articular disc, condyle head & fossa etc), what imaging would you use?

Answer 5

MRI - gold standard

Question 6

If there’s degenerative disease in the TMJ, what imaging is recommended?

Answer 6

CBCT

Question 7

What is SPECT & whats it used for?

Answer 7

Single photon emission computed tomography

nuclear imaging technique that uses gamma-ray detection to create three-dimensional images

• check for activity of joint
• only used as screening method

Question 8

what are the differences between CT vs MRI?

Answer 8

• MRI has no radiation dose to patient
• MRI scan takes longer
• More contraindications for MRI (pacemakers, cochlear implants, claustrophobic)
• MRI better for assessing

Question 9

What does PET stand for, what is it and its use?

Answer 9

Positron Emission Tomography

imaging technique that uses a small amount of radioactive material to see and measure cell activity in the body, helping diagnose and manage diseases such as cancer