ALU 101 UPDATED Exam Questions and
CORRECT Answers
Hounsfield Units - CORRECT ANSWER - How the absorption of different tissues is
quantified
Fluoroscopy - CORRECT ANSWER - allows physician to view moving parts of the body
in real time (used for arthroscopy, cardiac catheterization, stent placement)
Fine Needle Aspirate (FNA) - CORRECT ANSWER - obtains cells and/or fluid for
pathological dx
differentiates whether a cold nodule is benign/malignant
A-Mode, B-Mode, M-Mode & Grayscale - CORRECT ANSWER - provides info on
structural size, motion or both
creates moving image of heart including valve motion and wall motion
Contrast Agents - CORRECT ANSWER - allows better imaging for tubular/hollow
structures
can be used w/ plain x-ray, CT & MRI studies
Doppler Ultrasonography - CORRECT ANSWER - measures velocity & direction of
blood flow within heart and blood vessels
evaluates venous insufficiency, blood clots, arterial occlusion/stenosis, and identifies valvular
disorders
X-Rays - CORRECT ANSWER - a beam of radiation is emitted and scattered/absorbed by
different tissues (i.e. bone, fat, water, and air)
Advantages of US over MRI/CT Scanning - CORRECT ANSWER - 1. differentiates solid
from liquid
, 2. lower cost
3. portability
4. accessibility
5. no exposure from ionizing radiation
Hyperechoic, Hypoechoic, Anechoic Tissues - CORRECT ANSWER - 1. large number of
soundwaves
2. low number of soundwaves
3. no soundwaves (fluid)
Limitations to US - CORRECT ANSWER - 1. skill level of ultrasonographer
2. image resolution
3. "noise" produced when ultrasound waves hit gas & bone
Nuclear Medicine - CORRECT ANSWER - 1. uses scintigraphy (gamma camera) to
record radioactive material in target orgain
2. images bone
3. determines thyroid and hepatobiliary function
3. can help dx CAD and view cardiac physiology
Digital Radiography - CORRECT ANSWER - 1. Form of x-ray
2. emits low dose of radiation
3. allows radiologist to manipulate images for better visualization
Computed Tomography (CT/CAT) - CORRECT ANSWER - 1. sees fat, air, soft tissue &
bone
Oral/Instilled Contrast Agents w/ CT - CORRECT ANSWER - 1. useful for intracranial,
neck, abdominal, pelvic & lung images
CORRECT Answers
Hounsfield Units - CORRECT ANSWER - How the absorption of different tissues is
quantified
Fluoroscopy - CORRECT ANSWER - allows physician to view moving parts of the body
in real time (used for arthroscopy, cardiac catheterization, stent placement)
Fine Needle Aspirate (FNA) - CORRECT ANSWER - obtains cells and/or fluid for
pathological dx
differentiates whether a cold nodule is benign/malignant
A-Mode, B-Mode, M-Mode & Grayscale - CORRECT ANSWER - provides info on
structural size, motion or both
creates moving image of heart including valve motion and wall motion
Contrast Agents - CORRECT ANSWER - allows better imaging for tubular/hollow
structures
can be used w/ plain x-ray, CT & MRI studies
Doppler Ultrasonography - CORRECT ANSWER - measures velocity & direction of
blood flow within heart and blood vessels
evaluates venous insufficiency, blood clots, arterial occlusion/stenosis, and identifies valvular
disorders
X-Rays - CORRECT ANSWER - a beam of radiation is emitted and scattered/absorbed by
different tissues (i.e. bone, fat, water, and air)
Advantages of US over MRI/CT Scanning - CORRECT ANSWER - 1. differentiates solid
from liquid
, 2. lower cost
3. portability
4. accessibility
5. no exposure from ionizing radiation
Hyperechoic, Hypoechoic, Anechoic Tissues - CORRECT ANSWER - 1. large number of
soundwaves
2. low number of soundwaves
3. no soundwaves (fluid)
Limitations to US - CORRECT ANSWER - 1. skill level of ultrasonographer
2. image resolution
3. "noise" produced when ultrasound waves hit gas & bone
Nuclear Medicine - CORRECT ANSWER - 1. uses scintigraphy (gamma camera) to
record radioactive material in target orgain
2. images bone
3. determines thyroid and hepatobiliary function
3. can help dx CAD and view cardiac physiology
Digital Radiography - CORRECT ANSWER - 1. Form of x-ray
2. emits low dose of radiation
3. allows radiologist to manipulate images for better visualization
Computed Tomography (CT/CAT) - CORRECT ANSWER - 1. sees fat, air, soft tissue &
bone
Oral/Instilled Contrast Agents w/ CT - CORRECT ANSWER - 1. useful for intracranial,
neck, abdominal, pelvic & lung images
