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Review for Boards NMTCB 4 Flashcards | StudBud
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Review for Boards NMTCB 4
Review for Boards NMTCB 4
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1
What is the primary reason to have a patient phonate the letter ‘e” during a CT exam of the larynx?
it closes the pyriform sinuses
it demonstrates vocal cord mobility
it distends the laryngeal ventricles
2
Serum TSH levels must be greater than ___________ before administering 123 I or 131I for a metastatic diagnostic scan?
30 uIU/ml
10 uIU/ml
20 uIU/ml
3
An advantage of Xe127 over Xe133 is that
It can be used after a MAA perfusion study
None of the above
It is inexpensive
It has a shorter half life
4
What steps should be taken to reduce a star artifact from reconstructed SPECT images
Decrease the matrix size
Increase the radius of projection
Increase the number of projections
Increase the time per projection
5
Control of syntheses and secretion of thyroid hormones by thyroid stimulating hormone (TSH) secreted by the pituitary gl
Negative feedback
Positive feedback
6
When the decision to premedicate is made by the radiologist, it is important that steroids be started
at least 2 hours before contrast administration
30 minutes before contrast administration
at least 6 hours before contrast administration
7
Which part of the computer is used for data filtering
Array processer
ROM
ADC
Buffer
8
A disadvantage of using TC99m HSA for radionuclide ventriculography includes
Liver uptake
Relatively low photon flux
High radiation dose
Lung uptake
9
The pituitary gland is best demonstrated during CT with which of the following imaging planes?
axial
sagittal
transaxial
coronal
10
In pediatrics, inadequate blood supply to the bone causing bone death is a cause of which of the following diseases?
Wilm's tumor
LCP
Ewing's sarcoma
11
The purpose of the pulse height analyzer is
To filter out photons which strike the crystal from oblique angels
To minimize the amount of scattered radiation in the final image
To convert light into an electrical signal and to magnify that signal
To convert radioactivity into light
12
of transmission phantoms, which one requires the fewest images to test the spatial res over the entire detector face
Parallel-line equal space phantom
Four quadrant bar phantom
Hine-duley phantom
Orthogonal hole phantom
13
Which of the following would NOT enhance during the first several minutes of a post-contrast CT study of the neck?
internal carotid artery
jugular vein
vascular lesion
lymph nodes
14
For a routine CT exam of the pelvis, what gantry tilt is used?
no tilt is used
- 20 degrees
20 degrees
10 degrees
15
Which of the following are typical start and end locations for CT scans of the pelvis?
From the sternal notch through the iliac crest
From the iliac crest through the symphysis pubis
From the xyphoid process through the iliac crest
From the sternal notch through the symphysis pubis
16
Which of the following is NOT a reason for using thinner slices in the posterior fossa compared with the more superior r
to decrease radiation dose to the patient
To reduce streak artifacts
all the above
To improve spatial resolution
17
As a general rule this is set at a point that has roughly the same value as the average attenuation number of the tissue
window level
sampling rate
Standard deviation
18
In what circumstance is it acceptable to use a large-bore tunneled dialysis catheter for the injection of iodinated cont
A dialysis catheter should never be used for contrast media administration
whenever a standard peripheral IV access is not available
When the contrast flow rate is 2 ml/s or less
When the patency of the line has been verified by flushing with saline
19
Which of the following terms describes the appearance of an acute subdural hematoma on a CT image of the brain?
hyperdense
radiolucent
isodense
hypodense
20
Which of the following is the typical orientation for a localizer scan for a CT of the chest?
Transverse
Lateral
AP
Coronal
21
Beta Blockers are likely to be used as part of a cardiac CT protocol when the
Patient's heart rate is higher than 65 bpm
Patient's heart rate is less than 60 bpm
22
When performing parathyroid scintigraphy and applying dual isotope protocol using Thallium-201 & 99mTc Pertechnetate, di
99mTc parathyroid image is subtracted from Tl-201 thyroid image
Tl-201 thyroid image is subtracted from 99mTc parathyroid image
99mTc thyroid image is subtracted from Tl-201 parathyroid image
23
Typically, a Meckel’s diverticula will appear as a focal “hot” spot located in the:
Left lower quadrant
Right upper quadrant
Right lower quadrant
24
post injection, 40 mg of Lasix is administered by the nurse. After processing the study the T ½ clearance for the right
non-diagnostic study
renal failure
Obstructed hydronephrosis
Non-Obstructed hydronephrosis
25
What property of intravenous contrast media is responsible for its capacity to increase a structure’s ability to attenua
viscosity
Osmolality
ionic nature
iodine concentration
26
In a normally functioning system, an increase in circulating thyroid hormone will cause TSH secretion to
Decrease
Increase
stay the same
27
Choose the correct order in which the structures appear during a first pass study?
Right ventricle,pulmonary artery,lungs,pulmonary veins, left ventricle
Left ventricle, pulmonary veins, lungs, pulmonary artery, right ventricle
Left ventricle, pulmonary artery,lungs,pulmonary veins,right ventricle
Right ventricle,pulmonary artery,lungs,pulmonary veins, left atrium
28
What could be the cause of generalized, diffuse activity in the abdomen on a bone scan
Bone cyst
Malignant ascities
Free pertechnetate
Pacemaker
29
A CT study done for the screening, detection, or exclusion of pulmonary nodules or infiltrates are typically done
without IV contrast administration
using a wide slice thickness (>8mm) so the scan can be completed quickly,
first without IV contrast administration, followed by a repeat series with
30
Which of the following is most effective means of measuring low levels of removable radiation
With a TLD
With a pocket dosimeter
By performing a wipe test
By performing an area survey
31
Most well counters measure radioactivity by use of
An applied voltage from anode to cathode
A sodium iodine crystal
thermoluminescent crystals
A silver halide layer
32
During a 99mTc MAG3 renal scan, what is the normal peak activity of the kidneys during the cortical phase?
3-5 minutes
1-2 minutes
33
Reports of area surveys must include all of the following except
Date performed
List of isotopes used in the area
Equipment that was used to survey
A diagram of the areas surveyed
34
Thyrogen, a recombinant form of human TSH, may be given to patients prior to diagnostic imaging for metastases or 131I t
Two 0.9 mg doses, given IM
two 0.9 mg doses, given IV
35
perfusion scan shows a cold defect in the right base. If the ventilation study is normal what is the most cause 4 defect
Attenuation from heart
COPD
Pulmonary embolism
Pacemaker
36
The difference among the bolus phase, the non-equilibrium phase, and the equilibrium phase of contrast enhancement is pr
type of pathologic disease present
injection rate and scan delay
brand of iodinated contrast agent that is used
37
Of the choices offered which is the best imaging view for calculating right ventricular ejection fraction, w first pass
LAO 10 degrees
Anterior
RAO 60 degrees
RAO 30 degrees
38
Which of the following can be measured in millimeters
Field uniformity
Temporal resolution
Energy resolution
Spatial resolution
39
What is the left ventricle ejection fraction? Net ED=58,219 net ES=35,317
16%
60 %
39%
43%
40
Which of the following 99mTc radiopharmaceuticals crosses the intact blood brain barrier?
Bicisate
Gluceptate
Pentetate
Pertechnetate
41
The best collimator used for a first pass study
High sensitivity
LEAP
Medium energy
High resolution
42
1 ml of a sol is assayed & contains 206 mCi. If the sol is diluted to 9ml & the activity is 170 wht is geometric cor fac
0.65
1.2
10.9
18
43
A high resolution collimating would be most appropriate for
Myocardial imaging with TC99m pyrophosphate
Myocardial perfusion study with Tc99m sestamibi
First pass study with TC99m DTPA
Myocardial perfusion study with Tl 201 chloride
44
Which of the following is not true regarding data acquisition in frame mode
It has higher acquisition rate compared to list mode
Data can not be divided into different images at a later time
It requires much less memory then list mode
Incoming data are stored in time sequence
45
What is the most likely treatment choice for this patient with a suppressed TSH?
synthroid
I 131 therapy
Tyrosine kinase inhibitors
radiation
46
A package bears a DOT class II yellow label, has a TI of 0.8, and contains 10mCi of In111. What is the exposure @ 3ft
0.4 mR/h
0.8 mR/h
1.0 mR/h
7 mR/h
47
When performing a dual isotope myocardial perfusion rest/stress study, which isotope should be injected first
None of the above
TC99m
Tl201
It doesn’t matter which is injected first
48
The quantity of radiation dose received by the patient from a series of CT scans is referred to as the
MSAD
CTDI
XCAL
49
Why is lead shielding less beneficial in CT than it is in general radiography?
radiosensitive organs such as the thyroid gland can never be shielded witho
because of the narrow collimation used in CT, not much radiation is scatte
50
Which of the following is a malignant bone disease
Osteomyelitis
Piaget’s disease
Ewing’s sarcoma
Osteosarcoma osteoma
51
What is the purpose of a reducing agent in a Tc99m diphosphonate kit
To oxidize technetium
To lower the valence state of technetium, & improve tag efficiency
To improve the tag efficiency
To lower the valence state of technetium
52
What is the dose rate limit at the package surface for a shipment of radioactive material bearing a yellow III label
200 mR/h
200 rads
50 mR/h
200 mrem
53
It is imperative that all scans be completed before the equilibrium phase of contrast enhancement in studies of the
Brain
Liver
Sinuses
54
Only half the administrated dose of TC99m DTPA aerosol is delivered to the patient
False
True
55
Within what time frame must imaging be initiated following injection of Tl201 chloride in an excess perfusion study?
Within 10-15 minutes
Within 20-30 min
Within 5 minutes
Within a 4 hour
56
A right anterior oblique is useful for
Separation of ventricles from stomach on first pass
Visualizing the lateral wall of the left ventricle
Increasing the patient comfort & potentially improving image quality
Facilitating calculation of LVEF & RVEF on first pass
57
A water phantom is scanned and several ROIs are placed in the resulting image. The ROIs placed at the perimeter of the i
Cross-field uniformity
Low-contrast resolution
Linearity
Noise
58
The therapeutic effectiveness of 131I in treating hyperthyroidism results from the delivery of energy to thyroid tissue
γ particles
α particles
X rays
β particles
59
Which of the following types of pathologic conditions cannot be easily diagnosed from a CT scan of the brain?
traumatic hemorrhage
cerebral infarct
astrocytoma
Alzheimer's disease
60
A tech wishes to evaluate the intrinsic uniformity of a camera used 4 planar imaging and is preparing a dose. Wht suffix
10 mCi
200 uCi
20 mCi
2 mCi
61
If a dose rate at 3 m from a radioactive source is 100mrem/h, what will the dose be at 6 m?
12.5 mR/h
25 mR/h
75 mR/h
50 mR/h
62
What scanning plane was used to acquire this image
Sagittal
Transverse
Axial
Coronal
63
Filtered back projection of SPECT data initially creates
Sagittal images
Transaxial images
Oblique images
Coronal images
64
All of the following are reasons for obtaining a history before a CT exam is performed EXCEPT
to aide the radiologist in his or her interpretation of the CT examination
to verify that the patient has not exceeded his radiation limit
to select the appropriate protocol
to be sure the examination can be performed safely
65
a 64x64 matrix & two sources placed 30cm apart, there r 44 pixels b/w the activity peaks on activity profile. Pixel size
0.14 cm/pixel
6.8 mm/pixel
1.4 mm/pixel
6.8 cm/pixel
66
Subacute thyroiditis is characterized by an abrupt onset of thyrotoxic symptoms caused by hormone leaks from an inflamed
Low serum TSH level, high radionuclide uptake
Low serum TSH level, low radionuclide uptake
High serum TSH level, low radionuclide uptake
High serum TSH level, high radionuclide uptake
67
Why might a technologist use an asymmetric window around a photopeak
To include other emissions
To exclude Compton scatter
To exclude the Compton edge
None of the above
68
As matrix size increases, what must also increase?
Total imaging time
Total imaging time & computer memory used
Number of projections
Computer memory used
69
The mechanism of localization for bone marrow scanning is
Capillary blockade
Active transport
Ion exchange
Phagocytosis
70
Gaseous radio pharmaceuticals may only be used in rooms that are
Contain a oxygen supply
Have at least one window
Are at a negative pressure compared to surrounding rooms
Are a positive pressure compared to surrounding rooms
71
Over time the number of particles per ml in a reconstituted MAA kit will change
True
False
72
Esophageal reflux studies are usually performed with both solid and liquid phases
False
True
73
Which of the following cannot be evaluated by radionuclide ventriculography?
Conduction abnormalities
Wall motion
Wall thickness
Aneurysmal flow
74
See image
19%
24%
17%
21%
75
By what mechanism do diphosphonates localize in the bone?
Phagocytosis
Active transport
Capillary blockade
Ion exchange
76
Abnormalities of the middle and inner ear may be best demonstrated with CT utilizing__________sections?
2-4mm
1-2 mm
5mm
10mm
77
If after administration of furosemide, a patient still has activity in the renal calyces, there is probably
renal artery occlusion
poor renal function
renal infarction
collection system obstruction
78
Most of the photons emitted from the radio pharmaceutical which has been administered to a patient
Are converted to a voltage signal
Do not contribute to the final image
Are received by the sodium iodine crystal
All of the above
79
If the energy range for Cs137 at half maximum ranges from 623 to 700, what is the % energy resolution & is it acceptable
7.5, no
10.8, yes
11.6, yes
13.5, no
80
If SPECT myocardial study with TC99m PYP is performed using 64 views of 20s each over 360’, how long will the study take
21 min
92 min
112 min
18 min
81
The excretion half-time of intravenous iodinated contrast media in a patient with normal renal function is between
5 and 7 days
18 and 24 hours
1 and 2 hours
1 and 2 days
82
Patients with metastasis to the brain are at a greater risk for______________after the administration of an IV contrast
pulmonary effects, such as bronchospasm
seizures
contrast induced nephropathy
anaphylactoid reaction
83
The purpose of the photomultiplier tube is
To convert radioactivity into light
To convert light into an electrical signal and to magnify that signal
To filter out photons which strike the crystal from oblique angels
To minimize the amount of scattered radiation in the final image
84
What causes barium peritonitis?
The oral administration of a large volume of a barium sulfate solution in p
Barium leaking into the peritoneal cavity from a perforation of the GI trac
85
The study shows normal perfusion to the transplanted kidney with poor renal function and decreased urine output. What is
acute tubular necrosis
chronic rejection
hyperacute rejection
86
Which of the following isotopes would be effectively shielded by a plastic syringe
Ga67
Xe133
Sr89
Kr81m
87
The process of applying a filter function to an attenuation profile is known as:
Archiving
Reformation
Data processing
Convolution
88
The bulls eye display created after myocardial perfusion imaging represents
Only short axis images
An entire set of stress or rest SPECT images
None of the above
All part of the myocardial wall except apex
89
The distribution of aerosol particles in the lungs is influenced by all except
Amount of technetium added
Turbulent air flow
Rate of air flow
Particle size
90
The escape of contrast material from a needle or blood vessel into the subcutaneous tissues is called:
extravasation
infusion
influxation
extraversion
91
For gated cardiac blood pool scintigraphy (MUGA) which of the following is not correct
Both LAO and anterior views are required
A good Bolus is needed
A pyp needs to warm up to room temperature before reconstitution
Imaging is obtained 20 min or later after tracer injection
92
Which of the following is NOT contained within the mediastinum?
heart
esophagus
Lungs
bronchi
93
What is the purpose of a stannous ion in a diphosphonate kit
Acts a reducing agent
Maintains particle size
Provides a stabilizing force
Acts as an oxidizing agent
94
When performing a liver scan with sulfur colloid, the technologist notices that lung uptake is present. This is probably
Due to free TC99m in the sulfur colloid preparation
Patient being injected in the supine position
Too much Al+3 ion in the pertechnetate that was used for labeling
Lung metastasis
95
In the image below, was IV contrast administered?
yes
no
96
High-resolution CT of the chest incorporates which of the following protocols?
1 mm sections, bone algorithm
10 mm sections, bone algorithm
10 mm sections, standard algorithm
97
Why is it recommended to position the patient for a shoulder CT so that the unaffected arm is extended over the pt head'
To reduce streak artifact
To make the patient more comfortable
So the IV injection site can be more easily monitored
98
Which of the following is not a critical factor in obtaining a gated first pass study
Tracer boils of small volume
Positioning the heart in the center of the FOV
Use of a multi crystal gamma camera
Regular heartbeat
99
Which of the following must be done during disposal of a carton in which a shipment of I131 was received
RSO must be notified
Carton must be stored for 10 half lives before disposal
All of the above
Radioactive label must be removed or obliterated
100
Which of the following is the typical scan delay after the initiation of injection of contrast media for studies of the
65-75 seconds
15-25 seconds
85-95 seconds
