Imaging techniques Flashcards
What are the types of plain radiographs
- Intraoral
- Extraoral non-tomographic
- Extraoral tomogram
What are the types of intraoral radiographs:
- Periapical
- Bitewing
- Occlusal
What are intraoral radiographs used for?
- Caries diagnosis
- PA pathology
- Bone pathology
- Salivary stones
What are extraoral non-tomographic radiographs used for
- Orthognathic
- trauma
- sinus views
What is an example of extraoral-tomogram
- OPT
What are extra-oral tomogram used for?
- PA pathology
- Bone pathology
- Nerves
- Condyles
- Trauma
- Coronoid
- Sinusitis
What is the benefit of the CT scan rotating around the object
- You can get an image from multiple planes
What are CT scans used for
- Calcified tissues
- Calcified bones
- Facial trauma
- Infections
- Abscess
- Gas in the tissues
- Lymph nodes
- Salivary glands
- Abdomen
- Pelvis
What are Cone bean CT scans used for
- Implant planning
- Positions of impaction
- Foreign body
- Nerve injury
- Predict risk of nerve injury
What are MRI used for
- Blood vessels
- Organs
- Muscles
- Lymph nodes
How do ultrasound generate an image
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
Is ultrsound better for hard tissue or soft tissue
- Soft tissue as in hard tissue the sound waves would reflect off the hard tissue and not show structures behind the hard structure
What structure are ultrasounds good at taking images of?
- Lymph nodes in neck
How can ultrasounds differentiate between arteries and veins
- 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
What is fine needle aspiration cytology FNAC
- 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
