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Radiographic Pathology: Chapter 2 exam with correct answers 2024
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x-rays (1895), ultrasound (1956), CT (1972), MRI (1977), PET (1979), PET/CT & PET/MRI (2009) correct answers In what order where the medical imaging modalities discovered? What year? ultrasonography/sonography correct answers modality that uses high frequency sound waves that are pulsed into b...

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  • August 26, 2024
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  • 2024/2025
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Radiographic Pathology: Chapter 2
x-rays (1895), ultrasound (1956), CT (1972), MRI (1977), PET (1979), PET/CT &
PET/MRI (2009) correct answers In what order where the medical imaging modalities
discovered? What year?

ultrasonography/sonography correct answers modality that uses high frequency sound
waves that are pulsed into body tissues by use of a probe (the sound echos off the
tissues it is used to form cross-sectional images)

crystals in transducer correct answers device used in ultrasonography that sends and
receives the sound waves

strong echo correct answers type of reflection/echo produced by a water-tissue
interface

weak echo correct answers type of reflection produced by a tissue mass with small
differences in composition

anechoic correct answers term used to describe tissue/structure lacking a signal &
therefore appears dark (i.e. gallbladder)

hyperechoic & hypoechoic correct answers terms used to make comparisons of echo
intensities between adjacent structures

isoechoic correct answers term used to describe two structures that have the same
look even though the tissues are not the same

presence of acoustic barriers (air, bone, & barium) correct answers What are the
disadvantages of using ultrasonography?

accessible, uses no radiation, no associated adverse effects, & is the modality of choice
for pediatric & pregnant patients correct answers What are some advantages of using
ultrasonography?

computed tomography (CT) correct answers modality that produces cross-sectional
tomographic images by using a narrow x-ray beam & calculated attenuation coefficients;
new technology has moved to helical scanning in which the patient is continuously
scanned while moving through the gantry

volume rendering, 3D image reconstruction, virtual imaging correct answers What are
some post-processing capabilities of CT?

helical correct answers spiral continuous motion

, ultra-fast, accessible, & has post processing capabilities correct answers advantages of
computed tomography(CT)

utilizes radiation & possibility of overexposing patients correct answers disadvantages
of computed tomography (CT)

CT number (Hounsfield unit) correct answers number that reflects the attenuation
properties of the anatomic part

0 correct answers CT number (Hounsfield unit) of water

gray correct answers appearance of water on a CT scan

+1000 correct answers CT number (Hounsfield unit) of bone; highest CT number
possible

white correct answers appearance of bone on a CT scan

-1000 correct answers CT number (Hounsfield unit) of air; lowest CT number possible

true correct answers (true//false) Fat has a CT number less than 0.

true correct answers (true//false) Soft tissues have a CT number higher than 0.

magnetic resonance imaging(MRI) correct answers modality that uses a power magnet
& radiofrequency pulses to generate images of the body

axial, coronal, sagittal correct answers 3 planes an MRI patient can be imaged

relaxation correct answers term given to when protons begin to release to transfer their
absorbed energy as they move back to a low-energy state

T1 & T2 correct answers two types of relaxation that occur simultaneously

receiver coil correct answers listening device that's placed near that anatomic site
detects & calculates the time it takes for both the T1 & T2 relaxation types

high signal intensity correct answers term given to substances or anatomical parts that
appear white on an MRI image

low signal intensity correct answers term given to substances or anatomical parts that
appear dark on an MRI image

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