ALU 101 Exam Questions And Answers With Verified
Solutions – Latest Update 2026/2027 | Graded A+.
Hounsfield Units ANS How the absorption of different tissues is
quantified
Fluoroscopy ANS allows physician to view moving parts of the body in
real time (used for arthroscopy, cardiac catheterization, stent
placement)
Fine Needle Aspirate (FNA) ANS obtains cells and/or fluid for
pathological dx differentiates whether a cold nodule is
benign/malignant
A-Mode, B-Mode, M-Mode & Grayscale ANS provides info on
structural size, motion or both creates moving image of heart including
valve motion and wall motion
,Contrast Agents ANS allows better imaging for
tubular/hollow structures can be used w/ plain x-ray, CT
& MRI studies
X-Rays ANS 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 ANS 1. differentiates solid
from liquid
2. lower cost
3. portability
4. accessibility
5. no exposure from ionizing radiation
Hyperechoic, Hypoechoic, Anechoic Tissues ANS 1. large number of
soundwaves
2. low number of soundwaves
3. no soundwaves (fluid)
Limitations to US ANS 1. skill level of ultrasonographer
2. image resolution
3. "noise" produced when ultrasound waves hit gas & bone
, Nuclear Medicine ANS 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
Doppler Ultrasonography ANS measures velocity & direction of blood
flow within heart and blood vessels
evaluates venous insufficiency, blood clots, arterial occlusion/stenosis,
and identifies valvular disorders
Digital Radiography ANS 1. Form of x-ray
2. emits low dose of radiation
3. allows radiologist to manipulate images for better visualization
Computed Tomography (CT/CAT) ANS 1. sees fat, air, soft tissue & bone
Oral/Instilled Contrast Agents w/ CT ANS 1. useful for intracranial,
neck, abdominal, pelvic & lung images
Solutions – Latest Update 2026/2027 | Graded A+.
Hounsfield Units ANS How the absorption of different tissues is
quantified
Fluoroscopy ANS allows physician to view moving parts of the body in
real time (used for arthroscopy, cardiac catheterization, stent
placement)
Fine Needle Aspirate (FNA) ANS obtains cells and/or fluid for
pathological dx differentiates whether a cold nodule is
benign/malignant
A-Mode, B-Mode, M-Mode & Grayscale ANS provides info on
structural size, motion or both creates moving image of heart including
valve motion and wall motion
,Contrast Agents ANS allows better imaging for
tubular/hollow structures can be used w/ plain x-ray, CT
& MRI studies
X-Rays ANS 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 ANS 1. differentiates solid
from liquid
2. lower cost
3. portability
4. accessibility
5. no exposure from ionizing radiation
Hyperechoic, Hypoechoic, Anechoic Tissues ANS 1. large number of
soundwaves
2. low number of soundwaves
3. no soundwaves (fluid)
Limitations to US ANS 1. skill level of ultrasonographer
2. image resolution
3. "noise" produced when ultrasound waves hit gas & bone
, Nuclear Medicine ANS 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
Doppler Ultrasonography ANS measures velocity & direction of blood
flow within heart and blood vessels
evaluates venous insufficiency, blood clots, arterial occlusion/stenosis,
and identifies valvular disorders
Digital Radiography ANS 1. Form of x-ray
2. emits low dose of radiation
3. allows radiologist to manipulate images for better visualization
Computed Tomography (CT/CAT) ANS 1. sees fat, air, soft tissue & bone
Oral/Instilled Contrast Agents w/ CT ANS 1. useful for intracranial,
neck, abdominal, pelvic & lung images
