CT MRI PRE-TEST
Part of the CT gantry to reduce patient dose and enhance image contrast
gantry
Iridium 192
Prepatient
Collimator assembly
What is the gray matter appearance in CT
hypodense
hyperdense
hyperdensity
hypothyroidism
What is the routine head of CT protocol for acquisition of a scout to set up the scan
lateral
horizontal
hyperdensity
hypothyroidism
What is the process in which the planned arranged treatment field is verified using an x-ray machine and mimics the geometry of therapy machines to produce diagnostic quality radiograph?
simulation
lateral
hyperdensity
hypothyroidism
What is the primary reason why using betatron in radiation therapy became unpopular?
-low dose rate and limited field size
-Same ion size with Iodine
-Iridium 192
-Capillary blockade
What radioactive isotope is used in tandems and ovoids?
-low dose rate and limited field size
-Same ion size with Iodine
-Iridium 192
-Capillary blockade
The reason why Tc99m pertechnetate is taken up by thyroid gland?
-low dose rate and limited field size
-Same ion size with Iodine
-Iridium 192
-Capillary blockade
The mechanism of radiopharmaceutical localization in lung scanning
-low dose rate and limited field size
-Same ion size with Iodine
-Iridium 192
-Capillary blockade
The term used as the role of the sound attenuation in tissue .
5minutes
-HALF VALUE LAYER
Distance • energy • Field size
Prepatient
the characteristic pf a 1st generation Ct scan ?
5minutes
-HALF VALUE LAYER
Distance • energy • Field size
Prepatient
the Percentage of depth Dose is dependent to ?
5minutes
-HALF VALUE LAYER
Distance • energy • Field size
Prepatient
In computed tomography imager, what component of collimator controls the patient dose profile
5minutes
-HALF VALUE LAYER
Distance • energy • Field size
Prepatient
. In computed tomography, what is the most common matrix size
Magnet
- 512x512
— Ascending infection from urethra
Smaller than that of a cobalt 60 machine
Major component of MRI unit
Magnet
- 512x512
— Ascending infection from urethra
Smaller than that of a cobalt 60 machine
Most common cause of cystitis/UTI
Magnet
- 512x512
— Ascending infection from urethra
Smaller than that of a cobalt 60 machine
What is the penumbra of a linear accelerator beam?
Magnet
- 512x512
— Ascending infection from urethra
Smaller than that of a cobalt 60 machine
What will provide a visual representation of the dose at a various position across the radiation field
proximity of several radiosensitive organs and often small tumor margins.
Isodose curve
Tc-99m PYP (pyrophosphate)
Hypothyroidism
2. Why immobilization is particularly important in treatment of the head and neck cancer?
proximity of several radiosensitive organs and often small tumor margins.
Isodose curve
Tc-99m PYP (pyrophosphate)
Hypothyroidism
2. Why immobilizaThe radiopharmaceuticals used to “hot-spot” myocardial imagingtion is particularly important in treatment of the head and neck cancer?
proximity of several radiosensitive organs and often small tumor margins.
Isodose curve
Tc-99m PYP (pyrophosphate)
Hypothyroidism
The coil directly placed on the patient in order to image superficial
proximity of several radiosensitive organs and often small tumor margins.
Isodose curve
-Surface
Hypothyroidism
In dose calibrator quality control, when is the linearity checked?n multi slice ct defined as patient couch movement per rotation devided by
proximity of several radiosensitive organs and often small tumor margins.
Isodose curve
-Surface
quarterly
The best modality to demonstrate the rupture of the spleen as a result of blunt abdominal trauma.
mri
ultrasound
ct
xray
The pitch in helical computed tomography is defined as the patient couch movement per roration divided by
- Beam length
- Beam width
doppler
MRI signal strength
What will define the brightness of the image in magnetic resonance imaging
- Beam length
- Beam width
doppler
MRI signal strength
What technology made spiral ct possible?
- Beam length
- Beam width
slip ring
MRI signal strength
What low-z material used in patient support couch in a CT unit?
Data acquisition, image reconstruction, image postprocessing
Linear attenuation coefficient for water
- Carbon fiber
What is the proper sequence for producing a CT image?
Data acquisition, image reconstruction, image postprocessing
Linear attenuation coefficient for water
- Carbon fiber
What is the basis for the formula of computing the value of CT number?
Data acquisition, image reconstruction, image postprocessing
Linear attenuation coefficient for water
- Carbon fiber
3rd generation
Which CT generation produces ring artifact?
Data acquisition, image reconstruction, image postprocessing
Linear attenuation coefficient for water
- Carbon fiber
3rd generation
single most effective non-invasive technique to evaluate lung cancer, its location, metastasis and extent of masses
ct scan
Linear attenuation coefficient for water
- Carbon fiber
mri
. If the person falls from 3rd floor of the building and lands on the feet, the mechanism is
ct scan
Axial loading
GIVES SPECIFIC CYTOLOGICAL INFORMATION ABOUT THE LESION
mri
. Radiography assessment of the brain that shows occlusion in the cerebral blood vessels
MRA
MRI
CT
COMPUTED ANGIOGRAPHY
Which is true about the gadolinium enhance MR Urography in the Upper Track transitional cell carcinoma ?aphy assessment of the brain that shows occlusion in the cerebral blood vessels
It should be performed as the FIRST LINE IMAGING TEST than COMPUTED TOMOGRAPHY UROGRAPHY
70 YEAR OLD WOMAN WITH GROSS HEMATURIA
ALL PATIENT THAT DOES NOT HAVE HISTORY OF ALLERGY TO SULFA DRUGS
COMPUTED ANGIOGRAPHY
when performing CT urography, when is it best administrated the IV furosemide in addition to contrast material?
It should be performed as the FIRST LINE IMAGING TEST than COMPUTED TOMOGRAPHY UROGRAPHY
70 YEAR OLD WOMAN WITH GROSS HEMATURIA
ALL PATIENT THAT DOES NOT HAVE HISTORY OF ALLERGY TO SULFA DRUGS
COMPUTED ANGIOGRAPHY
when performing CT urography, when is it best .which of the following patIent is CT urography ( including scans before and after IV contrast material) indicated?administrated the IV furosemide in addition to contrast material?
It should be performed as the FIRST LINE IMAGING TEST than COMPUTED TOMOGRAPHY UROGRAPHY
70 YEAR OLD WOMAN WITH GROSS HEMATURIA
ALL PATIENT THAT DOES NOT HAVE HISTORY OF ALLERGY TO SULFA DRUGS
COMPUTED ANGIOGRAPHY
Which is true about MR Urography?
MR arthrogram
MR arthrogram has a high sensitivity and accuracy of atleast 90% in labral tears
It requires IV GADOLINIUM
It should be performed as the FIRST LINE IMAGING TEST than COMPUTED TOMOGRAPHY UROGRAPHY.
Which is true about the gadolinium enhance MR Urography in the Upper Track transitional cell carcinoma ?
MR arthrogram
MR arthrogram has a high sensitivity and accuracy of atleast 90% in labral tears
It requires IV GADOLINIUM
It should be performed as the FIRST LINE IMAGING TEST than COMPUTED TOMOGRAPHY UROGRAPHY.
best imaging modality for acetabular labral tear
MR arthrogram
MR arthrogram has a high sensitivity and accuracy of atleast 90% in labral tears
It requires IV GADOLINIUM
It should be performed as the FIRST LINE IMAGING TEST than COMPUTED TOMOGRAPHY UROGRAPHY.
true regarding MR arthrogram
MR arthrogram
MR arthrogram has a high sensitivity and accuracy of atleast 90% in labral tears
It requires IV GADOLINIUM
It should be performed as the FIRST LINE IMAGING TEST than COMPUTED TOMOGRAPHY UROGRAPHY.
What radiotherapy machine operates a principle of an electron will accelerate in a circulare orbit on changing magnetic field?
Betatron
Impedance
CT SCAN
QUANTUM NOISE
rupture of the spleen as a result of blunt abdominal trauma can be BEST demonstrated by:
Betatron
Impedance
CT SCAN
QUANTUM NOISE
most common cause of noise in CT scan:
Betatron
Impedance
CT SCAN
QUANTUM NOISE
what standard MRI pulse sequence can provide T1, T2, or proton density-weighted images?
Echo planar imaging
Impedance
CT SCAN
External auditory meatus
The axial scan can be obtained by placing the transducer on the parietal bone just above the.
Betatron
Impedance
CT SCAN
External auditory meatus
Hemorrhage on CT scans becomes isodence after
Proton
24 hours
Uniformity
Uncertainties in determining the tumor extent, penumbra of the beam and patient motion
. Which of the following is NOT a low LET radiation?
Proton
24 hours
Uniformity
Uncertainties in determining the tumor extent, penumbra of the beam and patient motion
CT equipment must be frequently calibrated so that water is consistently represented by CT number zero and other tissues with their appropriate CT number, This refers to
Proton
24 hours
Uniformity
Uncertainties in determining the tumor extent, penumbra of the beam and patient motion
When the treatment are designed by the radiation oncologist, margins are always added around a tumor because of
Proton
24 hours
Uniformity
Uncertainties in determining the tumor extent, penumbra of the beam and patient motion
What is the difference of densities in ct scan image called?
CONTRAST RESOLUTION
* ionizing constant
Computed Tomography
*linear attenuation coefficient
The ability of the given amount of radioactivity of a radionuclide to ionized air molecule is reffered to as
CONTRAST RESOLUTION
* ionizing constant
Computed Tomography
*linear attenuation coefficient
CT artifact that is most common in scanning the base of skull
CONTRAST RESOLUTION
beam hardening
Computed Tomography
*linear attenuation coefficient
CT artifact that is most common in scanning the base of skull
CONTRAST RESOLUTION
beam hardening
Computed Tomography
*linear attenuation coefficient
The best modality to demonstrate the rupture of the spleen as a result of blunt abdominal trauma
CONTRAST RESOLUTION
beam hardening
Computed Tomography
*linear attenuation coefficient
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