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
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)
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
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
2.
Positron Emission Tomography (PET) ANS evaluates pulmonary
nodules, lung cancer, colorectal cancer, esophageal cancer, head/neck
cancer, lymphoma, myeloma, Alzheimer's, Parkinson's, epilepsy &
hibernating myocardium
Limitations to PET scanning ANS 1. cost
2. accessibility
3. nature of radionucleide agent
4. elevated serum glucose/insulin levels can affect results
5. limited sensitivity in defining tumors less than 10mm
6. high degree of expertise required
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
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)
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
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
2.
Positron Emission Tomography (PET) ANS evaluates pulmonary
nodules, lung cancer, colorectal cancer, esophageal cancer, head/neck
cancer, lymphoma, myeloma, Alzheimer's, Parkinson's, epilepsy &
hibernating myocardium
Limitations to PET scanning ANS 1. cost
2. accessibility
3. nature of radionucleide agent
4. elevated serum glucose/insulin levels can affect results
5. limited sensitivity in defining tumors less than 10mm
6. high degree of expertise required
