Exams Flashcards
T/F: The choice of coil for any examination is one of the most important factors that determines the resultant SNR of the image.
True
Which of the following are true when using any type of coil?
Check that the cables are intact (i.e. not damaged)
Check that the coil is plugged in properly
Place the coil as close as possible to the area under examination
Place the coil on bare skin, wires crossed
Check that the cables are intact (i.e. not damaged)
Check that the coil is plugged in properly
Place the coil as close as possible to the area under examination
Image quality is dependent on which of the following factors?
SNR
CNR
Spatial resolution
Scan time
SNR
CNR
Spatial resolution
Scan time
Which of the following best defines CNR?
The ratio of the amplitude of signal received by the coil to the amplitude of the noise
The difference in the SNR between two adjacent areas
The ability to distinguish between two points as separate and distinct
The time required to complete the acquisition of data
The difference in the SNR between two adjacent areas
Spatial resolution may be increased by selecting which of the following?
Thick slices
Coarse matrices
Thin Slices
A large FOV
Thin Slices
Which of the following best represents a coarse matrix?
512 X 512
256 X 128
256 X 256
256 X 128
Which of the following best defines spatial resolution?
The difference in the SNR between two adjacent areas
The ratio of the amplitude of signal received by the coil to the amplitude of the noise
The ability to distinguish two between two points as separate and distinct
The time required to complete the acquisition of data
The ability to distinguish two between two points as separate and distinct
Scan time can be decreased by using which of the following?
The most NEX allowable
A fine matrix
A short TR
A long TR
A short TR
CNR between pathology and other structures can best be demonstrated by which of the following?
Utilizing T1 sequences
Non-contrast studies
Lower field strength magnets
Suppression of normal tissues via sequences that null signal from certain tissues (i.e. FLAIR, STIR)
Suppression of normal tissues via sequences that null signal from certain tissues (i.e. FLAIR, STIR)
SNR may be increased by using which of the following?
A small FOV
A coarse matrix
A fine matrix
Gradient echo sequences
A coarse matrix
T/F: If a technologist increases the matrix on a sequence (assuming the FOV remains the same), the spatial resolution will increase, but the SNR will decrease
True
T/F: Increasing the TR results in increased SNR and increased scan time.
True
T/F: Inversion recovery sequences begin with a 180 degree pulse.
True
Which of the following sequences uses a 90 degree flip angle followed by several 180 degree rephasing pulses?
SE
FSE
IR
GRE
FSE
Which of the following sequences fills all of K space in one repetition by using very long echo trains?
EPI
GRE
STIR
SE
EPI
Which of the following occurs because nuclei that move through the slice may receive only one of the RF pulses applied?
Entry slice phenomenon
Time of flight
Intra-voxel dephasing
MRA
Time of flight
T/F: Intra-voxel dephasing occurs as a result of the phase difference between stationary and flowing nuclei in the same voxel causing dephasing and signal loss.
True
Identify which of the following are remedies of flow-related artifacts:
TOF
Spatial presaturation pulses
Intra-voxel dephasing
Gradient moment nulling
Spatial presaturation pulses
Gradient moment nulling
T/F: Chemical shift artifact occurs when anatomy that lies within the boundaries of the receiver coil exists outside the FOV.
False
T/F: Phase mismapping can be reduced by using spatial presaturation pulses between the origin of the artifact and the FOV.
True
Which of the following is used to trigger each RF excitation pulse with cardiac gating?
P wave
QRS complex
R wave
T wave
R wave
For optimal T1 weighting with ECG/Pe gating, a technologist would use which of the following:
Use 1 R to R interval
Use 2 or 3 R to R intervals
Use the trigger window
Use the PQRS complex X 2
Use 1 R to R interval
T/F: The emotional well being of a patient is just as important as their physical condition.
True
Which of the following is NOT a type of MRA?
Time of Flight (TOF)
Diffusion Weighted Imaging (DWI)
Phase Contrast (PC)
Contrast Enhanced MRA (CE-MRA)
Diffusion Weighted Imaging (DWI)
T/F: Gradient echo pulse sequences are preferred over spin echo sequences when attempting to reduce magnetic susceptibility artifact.
False
The b value determines the:
the type of proton being sampled
amount of diffusion weighting on an image
the TI
extrinsic contrast parameters
amount of diffusion weighting on an image
Sagitals through the head are prescribed from:
Posterior to Anterior
Left to Right
Right to Left
Superior to Inferior
Left to Right
Axial slices through the head/brain are prescribed from:
Left to Right
Right to Left
Superior to Inferior
Inferior to Superior
Inferior to Superior
T/F: Coverage for axial slices includes the foramen magnum to the superior surface of the brain.
True
T/F: There are five ventricles in the brain.
False
Which of the following sequences provides temporal resolution of enhancing lesions and indicates brain activity?
FLAIR
STIR
T1
Perfusion
Perfusion
Which of the following best describes the appearance of acute stroke on an axial DWI?
Bright
Dark
Bright
Which of the following sequences is known for its sensitivity to magnetic susceptibility?
SE
Perfusion
GRE
FLAIR
GRE
T/F: When positioning a patient for a head MRI exam, the horizontal alignment light should pass through the nasion.
True
Which cranial nerve provides motor control to the muscles of mastication and relays sensory information from the face and the head?
3rd
4th
5th
7th
5th
Which lobe of the brain is scanned for seizure protocol?
Parietal
Occipital
Temporal
Frontal
Temporal
T/F: Careful timing of post contrast pituitary scans is important because eventually the pituitary gland enhances itself, as well as a microadenoma, if present.
True
T/F: The main source of artifact in the brain is from flow motion of the popliteal artery.
False
Contrast is used to assess which of the following (select all that apply):
Active MS plaques
Metastases
The age of an infarct
Tumors such as meningiomas or neuromas
Active MS plaques
Metastases
The age of an infarct
Tumors such as meningiomas or neuromas
Which sequence describes this image:
Axial STIR
Axial FLAIR
Coronal STIR
Coronal FLAIR
Axial FLAIR
Which of the following anatomy is visualized on this image:
Lateral Ventrical
Parietal Lobe
IACs
Orbits
IACs
Which of the following best describes the pathology visualized on this image:
IACs
Acoustic Neuroma
Swan Ganz
Seizures
Acoustic Neuroma
Which of the following best describes the pathology visualized in this image:
Normal Pituitary- No Pathology
Macroadenoma
Microadenoma
Seizure Activity
Macroadenoma
Axial images of the orbits are angled with the:
lens
optic nerve
hard palate
temporal lobe
optic nerve
Common sources of artifact for an orbital MR exam include all of the following except:
eye movement
flow motion in the Circle of Willis
using a small FOV- aliasing
zipper artifact
zipper artifact
Which of the following is another word for bulging of one or both eyes?
Pseudotumor
Proptosis
Sarcoid
COW
Proptosis
Which of the following is a demyelinating disease of the CNS?
COW
CCF
Graves disease
Multiple sclerosis
Multiple sclerosis
T/F: Fat saturation techniques are valuable when imaging the orbits post contrast due to the presence of orbital fat.
True
Sagital TMJ images are angled with:
orbital nerve
perpendicular to the mandibular condyles
the temporal bone
the temporal lobe
perpendicular to the mandibular condyles
T/F: Closed and open mouth views are performed for TMJs.
True
Which of the following sequences would be most helpful in diagnosing MS?
Sagital STIR
Sagital FLAIR
Thin slices through the optic chiasm
Open and closed views
Sagital FLAIR
To image the veins of the head:
a pre-saturation pulse is placed inferior to the FOV
a pre-saturation pulse is placed superior to the FOV
contrast must always be used
the COW is visualized
a pre-saturation pulse is placed inferior to the FOV
Which cranial nerve has receptors for the sense of smell?
CN I
CN II
CN III
CN VI
CN I
Which of the following contribute to the structure of the bony orbit? (choose all that apply)
Frontal
Lacrimal
Sphenoid
Occipital
Frontal
Lacrimal
Sphenoid
Indications for an MRA of the Head include which of the following?
Intracranial vascular assessment of aneurysms and infarcts
Suspected internal meniscal derangement
Graves disease
Proptosis
Intracranial vascular assessment of aneurysms and infarcts
Which of the following would best demonstrate hemorrhage?
STIR
FLAIR
GRE
FSE
GRE
Which of the following protocols would include slices through the temporal lobes?
Orbits
MS
Seizures
IACs
Seizures
T/F: Careful timing of post contrast pituitary scans is important because eventually the pituitary gland enhances itself, as well as a microadenoma, if present.
True
T/F: There are four ventricles in the brain.
True
How many bones contribute to the structure of the bony orbit?
3
5
7
9
7
The b value determines the:
the type of proton being sampled
amount of diffusion weighting on an image
the TI
extrinsic contrast parameters
amount of diffusion weighting on an image
Sagitals through the head are prescribed from:
Posterior to Anterior
Left to Right
Right to Left
Superior to Inferior
Left to Right
Which sequence describes this image:
Axial STIR
Axial FLAIR
Coronal STIR
Coronal FLAIR
Axial FLAIR
Sagital cervical spine slices are prescribed in which direction?
Right to Left
Left to Right
Posterior to Anterior
Anterior to Posterior
Left to Right
T/F: A common artifact seen when scanning the cervical spine region is the result of swallowing motion.
True
If a patient will not fit in the spine coil with the anterior aspect snapped down, which of the following would be the next best option to obtain the best possible SNR?
Use a halo
Use a flex coil
Use the anterior piece of the head coil
Use a c-collar
Use a flex coil
T/F: Contrast is routinely used for disc disease in the cervical spine.
False
T/F: Contrast is routinely used in the cervical spine for patients with a diagnosis of MS.
True
T/F: A Chiari Malformation can be see on a cervical spine image.
True
T/F: All halos are MRI safe.
False
On T1 weighted images of the spine, the CSF appears:
Hyperintense to the spinal cord
Hypointense to the spinal cord
Isointense to the spinal cord
None of the above
Hypointense to the spinal cord
For optimal imaging of the cervical spine, patient positioning and local coil placement are:
Supine/around the neck to include from C1 to C7
Supine/on top of the neck to include from C1 to C7
Supine/beside the neck to include from C1 to C7
Prone/on top of the neck to include from C1 to C7
Supine/around the neck to include from C1 to C7
A patient presenting with neurological symptoms consistent with cervical cord compression, neck pain, and raised inflammatory markers likely has ________. This patient’s sagital T1 +C can be seen below.
Cervical Spine Metastases
Spinal Meningioma
Multiple Sclerosis
Epidural Abscess
Epidural Abscess
The image shown below was acquired in which imaging plane?
Axial
Sagital
Coronal
Off-axis (oblique)
Sagital
The image shown below is an example of:
A T1 weighted image
A T2 weighted image
A spin (proton) density weighted image
A T2* weighted image
All of the above
A T2 weighted image
Which vertebra is indicated by the arrow?
C3
C4
C5
C6
C4
Which best describes the anatomy the arrow is indicating in the image below?
CSF
Vertebral Body
Spinal Cord
Cervical disc
Spinal Cord
On the image shown below, the vertebral bodies appear bright because:
Bone is always bright on MR images
Cortical bone cannot be seen on MR images
Bone marrow contains fat
Bone marrow contains water
Bone marrow contains fat
Which vessel is indicated by the blue arrow shown below?
Right internal carotid
Right external carotid
Left vertebral
Left common carotid
Left vertebral
What is indicated by the blue arrow in the image shown below?
Epiglottis
Pharynx
Anterior Longitudinal Ligament
Supraspinous Ligament
Anterior Longitudinal Ligament
Which of the following best describes the imaging plane shown below?
Axial
Sagital
Coronal
Off axis (oblique)
Axial
T/F: FOV boundaries for sagital thoracic spine images include from T2 to L1.
False
Axial slices through the thoracic spine are angled parallel to:
Z joints
spinal cord
spinous processes
disc spaces
disc spaces
T/F: Additional thinner axial slices are often prescribed through areas of pathology.
True
To minimize aliasing in axial slices of the thoracic spine, one would use:
Chemical presaturation
Saturation pulses
Breath holds
Oversampling
Oversampling
Flow from CSF in the thoracic spine can be minimized by utilizing:
Chemical Presaturation
Oversampling
Saturation Pulses
Breath holds
Saturation Pulses
On sagital T-Spine images that demonstrate cord compression, the vertebral level can be determined by (think about how you determine this in clinicals when scanning):
Using the sternal notch as a landmark and counting down from T1
Using the xyphoid as a landmark and counting up from T12
Using a large FOV localizer and counting down from C2
Using lead markers to mark T12 and T1 on large FOV images
Using a large FOV localizer and counting down from C2
T/F: SNR is dependent on the quality of the coil
True
Cancer that begins in the plasma cells in bone marrow is known as:
Glioma
Multiple Sclerosis
Multiple Myeloma
Metastatic disease
Multiple Myeloma
In spine imaging, to rule out metastatic lesions of the spinal cord, contrast enhancement can be used with T1 weighted images because:
Metastatic lesions enhance and normal cord does not
Scar enhances and disk does not
Normal cord enhances and metastatic lesions do not
CSF is bright and cord is dark
Metastatic lesions enhance and normal cord does not
T/F: Myeloma is the medical term for a tumor that begins in the brain or spinal cord.
False
A patient presents with pain in the neck and shoulder, numbness and tingling in the fingers, and a weak grip. Which of the following is most likely the cause?
Whiplash
Herniated thoracic disc
Thoracic outlet syndrome
Schwannoma
Thoracic outlet syndrome
T/F: Spinal schwannomas arise from nerves within the spinal canal.
True
The following image was most likely acquired with which of the following?
A 5 inch surface coil
Phased array coils
A Helmholtz coil pair
The body coil
Phased array coils
Which of the following best describes the image below?
Multiple Myeloma
Metastatic disease
Compression fracture
Herniated disc
Compression fracture
Which vertebra is involved in the pathology shown on the image below?
T2
T1
C7
T3
T1
Which of the following best describes the weighting used to obtain the image shown below:
T1
FLAIR
T2
T1 FS
T2
Which of the following best describes what is indicated by the arrow on the image below:
Gibbs or truncation artifact
Chemical shift artifact
The supraspinous ligament
The cruciate ligament
The supraspinous ligament
Which of the following is indicated by the arrow shown on the image below:
Saturation band
Anterior spinous ligament
Signal drop off
Metastatic disease
Saturation band
Which of the following is the most inferior portion of the spinal cord?
Cauda equina
Conus medullaris
Filum terminale
Sacral hiatus
Conus medullaris
At which level does the spinal cord typically terminate?
L1-L2
L2-L3
L3-L4
L5-S1
L1-L2
Which of the following anchors the spinal cord to the coccyx?
Conus medularis
Filum terminale
Cauda equina
Sacral hiatus
Filum terminale