Lecture 2 Flashcards
What kind of image is this
CT scan
What kind of image is this
X-Ray
What are the transmission type images
X-Ray, CT
What is the emission type
MRI
What is the reflective type of image
Ultrasound
What is this picture from
MRI
What kind of image is this
Ultrasound
Bright white bone is seen in what 2 kinds of images
Ct, X-Ray
What kind of image gives the most detail on soft tissue
MRI
On an MRI bone is _____
Dark
What may be used for transmission type to aid visual imagery
Contrast
What does using contrast do with X-Rays & CT’s?
Improves images of hollow spaces
Transmission types are what
Beams of high-energy photons that are transmitted through body structure
In an X-Ray density differences are seen as
Shades of gray
In an X-Ray & CT-higher density is seen as what color
White
In an X-Ray & CT- lower density (radio-translucent) is seen as what color
Black
A CT density is measured on what scale
Hounsfield scale
How does an MRI work
Energy of hydrogen protons in a strong magnetic field gets detected
Modality?
View?
CT, Axial
Modality?
View?
CT, coronal
Modality?
X-Ray
What is angiography
Imaging of vasculature
How do you achieve angiography
With transmission OR emission techniques
What is an arteriogram
Angiography of arteries
How do you get a standard angiogram
X-Ray
What determines the image seen on an ultrasound screen
Echogenicity of tissue
What is echogenicity in ultrasounds
The amount of ultrasound reflection by a tissue (relative to surrounding tissues)
What is the color scale of ultrasounds
Scale from white- black
What type of tissue is bright white on an ultrasound
(dense/stiff objects)
-Bone, dense connective tissue, fat
Bright white is considered what on an ultrasound
Hyperechoic
Medium gray is considered what on an ultrasound
Isoechoic
What tissues are considered isoechoic on an ultrasound
Average density /stiffness- liver/spleen
Dark gray is considered what on an ultrasound
Hypoechoic
What tissues are considered hypoechoic on an ultrasound
Low density/ stiffness- nerves, skeletal muscle, kidney cortex
Black is considered what on an ultrasound
Anechoic
Anechoic is indicative of what kind of structures
Fluid filled structures (shadows)- Vessels, csts, bladder
Name 3 kinds of ultrasound probes
Linear array probe, curved array probe, phased array probe
What is the high frequency array probe
Linear array probe
2 characteristics of a high frequency array probe
Good image detail, poor penetration
Linear array probes are used for what kind of exams
Shallow (just below skin surface)
Name 4 exams a linear array probe is used for
Ocular, carotid, carpal tunnel, MSK
What are the 2 kinds of low frequency array probes
Curved (curvilinear) and phased array probe
Low frequency transducers are good for what
Modest image detail, good penetration
Curved (curvilinear) array probes are used for what kind of exams
Abdominal exams (liver, gallbladder, kidney)
Phased array probes are used for what kind of exams & what are examples
Intercostal exams- Heart/ lungs
