Contrast resolution and Spatial resolution describe the ability of a CT scanner to differentiate objects with similar linear attenuation coefficients.

Which of the following will increase the average photon energy of the x-ray beam?

Which formula may be used to calculate the dimensions of a pixel?

The convolution method is not related to the filtered back projection.

What is indicated by the arrow in the image?

Which of the following will reduce the patient dose at the expense of increasing the appearance of noise in the CT image?

Patients acquiring a(n) infection while staying in a health care institution are referred to as having a _____________ infection.

Of the list below, which are considered as basic types of iodinated contrast media?

1. Diatrizoate
2. Metrizoate
3. Iothalamate

What is the primary reason iodine is the most common material used in radiopaque contrast media?

Due to the density, barium sulfate suspensions used for CT examinations must be a concentration of…

When performing a CT examination of the thoracic spine of a patient whose thorax measures 38 cm which of the following display fields of view (DFOV) should be used?

A patient has a prior history of lymphoma. Of the following sets of slice widths and spacing, which would be best for a CT scan of the abdomen and pelvis?

Partial volume averaging is most likely to be caused by which of the following slice widths?

Increasing mAs is the best method to increase the average photon energy of the x-ray beam.

The binary language computer term for the smallest unit of information is the…

An interpolation is a mathematical tool used to estimate a function’s behavior.

What is indicated by the arrow in the image?

To reduce the risk of brain damage to a patient experiencing cardiac arrest, CPR should be administered within 10 minutes of the patient’s last breath.

Why is it necessary to shield the patient both above and below their body during a CT examination?

Of the following sets of values, which would be considered normal levels for blood urea nitrogen and creatinine, respectively?

Severe adverse reaction to iodinated intravenous contrast media may include which of the following:

1. Urticaria
2. Vomiting
3. Anaphylaxis

Which of the following can be accurately demonstrated during a CT study of the abdomen without the use of iodinated contrast media?

1. Appendicitis
2. Renal stone
3. Diverticulitis
4. renal cyst

Outpocketings of the wall of the colon are commonly associated with ____________.

When using intravenous contrast media for a CT examination of the neck, a sufficient volume would be…

To decrease the partial volume effect narrow slice (section) widths should be used.

The greatest factor affecting the contrast resolution of a CT scanner is…

Once the x-ray beam passes through an object the intensity of the beam to a detector is called the…

Spiral-helical CT requires less power for and rotates for shorter periods of time than conventional scanners.

What is indicated by the arrow in the image?

When no overlap or gap exists between adjacent slices of a CT scan, the CTDI will be __________ the MSAD.

When using a power injector to deliver intravenous contrast material which type of needle is best suited?

Disassociating into charged particles when placed into a solution is the term given to _____________ contrast material.

Site preparation for an invasive procedure should include which of the following statements concerning the use of an antiseptic?

To accurately demonstrate a ______________ the use of intravenous iodinated contrast media would be necessary during the CT study of the abdomen.

A type of renal mass often seen in pediatric patients developing from immature kidney cells is termed…

The amount of contrast volume recommended for an intravenous iodinated contrast injection for imaging the neck is between 100-150mL.

Retrospective reconstruction uses scan data (raw data) to reconstruct a second image with an adjustment in a technical factor.

What is the largest disruptor of the contrast resolution of a CT scanner:

Predetector collimation of the CT x-ray beam results in which of the following?

For multi-slice scanners, beam pitch can be calculated by using the table distance traveled for each gantry rotation divided by the beamwidth.

What is indicated by the arrow in the image?

Water-soluble based oral contrast (gastroview) should not be used when?

The term ____________ describes a contrast material that does not dissociate into charged particles within a solution.

Contrast materials that do not dissociate when placed in an aqueous solution due to their low osmolatic nature are called…

The largest occupational exposure results from the interaction between x-ray and matter in which of the following?

The gantry angle for a CT of the head should be…

To best demonstrate detail of the paranasal sinuses a slice thickness of _________ should be used.

What is the name of fibrous connective tissue that binds the kidneys in the retroperitoneum?

Most cupping artifacts occur in CT images of the____________.

To best demonstrate the bony details of a shoulder joint a ___________________ algorithm should be used.

Predetector collimation removes scatter radiation before it reaches the detectors.

Slice pitch is calculated by the table distance traveled for five consecutive gantry rotations divided by the slice width.

What is indicated by the arrow in the image?

Which cuts are best suited for a routine CT soft tissue neck?

The diameter of the lumen of a needle used for the injection of contrast media is described as…

When placing a butterfly needle into a vein for intravenous contrast administration, the correct angle of insertion is…

Average osmolality for high osmolar contrast material would be…

To best evaluate coronary artery disease which of the following types of CT scanners should be used?

Of the following abnormalities, which would appear hyperdense compared to the surrounding tissues during a CT examination of the abdomen using iodinated intravenous contrast media?

The term used to describe a rapidly obtained CT scan with minimal interscan delays is…

The matrix size of a reconstructed image will be __________ when the DFOV is 25 cm and the pixel area is 0.25 mm 2.

Several names are commonly used to describe high spatial frequency algorithms used for imaging sharp density changes occurring in bone tissue. These include bone, edge, and detail.

Give the voxel dimension for an image that was produced with a 1.0 mm aperture size and was displayed using a 512 2 matrix and a 15cm DFOV.

Slice thickness is governed by the largest single detector element.

What is indicated by the arrow in the image?

What is an average scan delay on a portal-venous phase abdomen?

What is adult normal respiration?

Which of the following is considered the most accurate method to verify a patient’s identity?

Place the stages of infection in the correct order.

The flow rate for a biphasic technique for a spiral CT study of the liver would include the which of the following sets?

When performing a high-resolution chest CT which of the following protocols should be used?

Of the following, which would not require the use of intravenous iodinated contrast media to be visualized during a CT examination of the brain?

The term used to describe a rapidly obtained CT scan with minimal interscan delays is…

The differences in the generations of CT scanners are based on the configuration of the…

Reference detectors of third-generation CT scanners are used to measure the intensity of attenuated radiation and are used by the computer during the calculation of the linear attenuation coefficient.

To decrease the quantum noise of a CT image, which of the following technical adjustments should be made?

1. Increase the mAs
2. Decrease the slice width
3. Increase the slice width

CTDI and MSAD can be used to calculate the dose in spiral CT.

What is indicated by the arrow in the image?

The greatest amount of partial volume artifact would be displayed in which of the following?

Administering meds via parenteral route means:

What is the normal range for adult blood urea nitrogen (BUN) levels?

Systolic blood pressure in a normal adult should range between…

An infection that occurs from indirect contact with a contaminated object is termed…

The appearance of an acute subdural hematoma on a CT image of the brain can be described as…

The best method to enlarge an area of a CT image for closer examination (such as the sacrum from a CT image of the pelvis) would be to use targeting rather than magnification.

Dynamic is a term used for a CT exam obtained at a slow pace with minimal interscan delays to allow data acquisition during peak enhancement phase.

Of the following types of image noise which does the CT technologist have the ability to most easily reduce?

The reference detectors in a third-generation CT scanner are positioned at the peripheral portions of the detector array to…

As the section (slice) width is increased the collimation is decreased.

What is indicated by the arrow in the image?

What is indicated by the arrow in the image?

Beam hardening artifacts can appear as inaccurate CT numbers in the CT image but NOT streaks in the image.

Which of the following should be included if the patient has a prior history of an allergic reaction to iodinated contrast media?

Systemic hypotension causes a condition of cerebral ischemia, the term used to describe this is…

Which of the following describes the term urticaria?

When describing a patient who is having difficulty swallowing the following term would be used?

Allergies to shellfish are ALWAYS considered an absolute contraindication to the use of intravenous iodinated contrast media during CT examinations.

When performing a CT examination on a patient who was in an MVA three days prior, it is NOT necessary to use iodinated contrast media to R/O a possible subdural hematoma.

Water-soluble oral contrast media used for CT scans of the abdomen and pelvis contain approximately _________ iodine.

The type of image reconstruction used in the first-generation prototype CT scanner was _____________.

With cupping artifacts, CT numbers are higher at the edges of the image and lower in the center.

Decreasing the DFOV will magnify the CT image on the display monitor.

What is indicated by the arrow in the image?

What is indicated by the arrow in the image?

If the filter at the aperture of the x-ray tube removed even more low energy x-ray photons which of the following would result?

Which of the following symptoms would be exhibited in a patient experiencing shock?

Of the following x-ray interactions between the x-ray beam and the patient which results in the most patient dose?

The most sensitive gestational trimester of the fetus is during the…

A complication following CT-guided needle biopsy of the lung is…

Of the following, which would not be considered an absolute contraindication to the use of intravenous iodinated contrast media during a CT examination of the kidneys?

When performing a CT scan of the neck which of the following will produce the best scout or localizer projection?

The proper patient position for a CT study of the brain would place the patient in which of the following?

Which of the following statements is correct concerning a CT image displayed in a window with a level of 0 and a width of 500?

A(n) ______________ is capable of causing an edge gradient artifact.

To magnify the CT image on the display monitor, which of the following should be used?

What is indicated by the arrow in the image?

What is indicated by the arrow in the image?

Which of the following will most likely remove a ring artifact?

When administering intravenous iodinated contrast media what type of infection control technique is required?

Which of the following CT procedures require written consent from the patient in the form of a signature to perform?

Initial treatment for a patient experiencing a severe vagal reaction to iodinated contrast media that includes bradycardia include:

Of the following scan field of view (SFOV) which is the best choice for the acquisition of a CT head examination on an average adult patient?

The average density of a solitary pulmonary nodule indicates it is benign when it falls within the following ranges…

The best scout or localizer projection for a CT scan of the neck is the anteroposterior projection.

To provide the greatest soft-tissue detail during a CT study of the pelvis a _______________ algorithm should be used.

Specialized CT images reconstructed from a CT angiography formed from the greatest density reading encountered from each ray is called a(n)…

The interface between dense bone and soft tissue is a common site for the edge gradient effect to occur.

Phantoms can be used to measure slice thickness, noise, and contrast resolution.

What is indicated by the arrow in the image?

What is indicated by the arrow in the image?

The direction of the streaks that result from the edge gradient effect is perpendicular to the direction of the sharp density difference interface.

Which below are accepted sites for IV contrast injection?

Small children undergoing CT examinations are commonly sedated with the medication _______________.

Place the following radiographic examinations in the order in which they should be performed on a single patient.

When completing a CT examination for the post-myelogram of the lumbar spine in an adult patient, which of the following would be an acceptable range for contrast volume for the intrathecal injection?

When injecting the brain during a CT examination with intravenous contrast media the following anatomic area that does not enhance is?

The acetabulum is formed by which of the following pelvic bones?

1. Pubis
2. Ischium
3. Ilium

Of the following pathologic processes, which is an interstitial disease of the lungs?

The _________________ of the CT scanner determines the ability of the scanner to image small high-density objects.

The scan geometrics of a third-generation CT scanner has which of the following relationships?

CT noise is quantified as a percentage of overall contrast.

What is indicated by the arrow in the image?

What is indicated by the arrow in the image?

An accurate way to eliminate the partial volume artifact is to decrease pitch without changing slice thickness.

The patient dose is DIRECTLY affected by which of the following technical factors?

Of the following, which is NOT considered an isolation technique category?

The ability of a fluid to flow is described as…

Which of the following would be the most correct range for a scout (localizer) image of the abdomen?

The portions of the brain that enhance during a CT examination of the brain with iodinated contrast media are the posterior horn of the lateral ventricle and the cranial blood vessels.

A CT image of the L-spine was acquired using a large SFOV (48 cm). Which of the following DFOV sizes should the image be displayed with?

The first-generation CT scanners used “pencil” x-ray beam technology and one detector.

The _________ artifact is NOT affected by the CT technologist.

Third generations CT scanners use a rotate – stationary scan geometric relationship between the x-ray tube and detector array.

Xenon is an ideal gas for CT due to its low atomic number and low solubility.

What is indicated by the arrow in the image?

The device used to measure the radiation dose to the patient from a CT examination is…

A(n) _______ is an artifact resulting from a high spatial frequency interface between tissues with a great difference in density.

Before administering intravenous iodinated contrast material, the technologist should question the patient on…

Which of the following statements is correct regarding ionic and non-ionic iodinated contrast material?

The normal range of respiratory rate in a child is…

A nonmalignant enlargement of the prostate gland that is common in older men is referred to as…

When performing a CT study of the pelvis the following technique will aid in the visualization of the vagina…

Which anatomic area is CT-guided needle biopsies most commonly performed?

What is the average CT value for blood?

Which of the following quality control tests should be performed annually?

1. CT number calibration
2. Standard deviation
3. Laser localization device

An edge gradient artifact is seen in a CT image of a patient who has had their gallbladder removed. What would cause this artifact?

Quantitative CT is commonly used for calculating mineral/bone content for degenerative bone diseases.

What is indicated by the arrow in the image?

The total quantity of radiation dose received by the patient from a CT scan series is termed…

All scan parameters being equal, which one of the following phased array coils covering the same anatomy, will result in the best SNR?

1. 2 coil phased array
2. 4 coil phased array
3. 6 coil phased array
4. 8 coil phased array

The number of ions formed when a substance dissociates in a solution is referred to as ________________.

The intravenous injection of contrast or medication in one complete dose within a short period of time is referred to as…

Of the following, which route of drug administration provides the most rapid absorption and action within the human body?

A hepatic hemangioma may become ________________ after the intravenous administration of iodinated contrast media and no longer be visible on the CT image.

The plane passing vertically through the body dividing it in the left and right portions are…

Of the following types of contrast material which may be used during a CT examination of the chest?

The reconstruction by the computer of a CT image received from the transmission signal produced by the detectors must be converted into numeric information by a(n)…

Which of the following tests are performed frequently on the CT scanner?

1. CT number calibration
2. Standard deviation (noise levels)
3. Laser-localization device

The 1979 Nobel Prize was shared by the scientists ___________ and ___________ for their research in Computed Tomography.

Multiplanar reconstruction is also known as image reformatting.

What is indicated by the arrow in the image?

When speaking of x-ray radiation, which of the following is true?

The term osmolality is based on ______________ and refers to the biologic effect of iodinated contrast media.

When a CT examination of the lumbar spine calls for iodinated contrast material, the contrast media is placed directly into the…

Which of the following is the correct order of actions to be taken during cardiopulmonary resuscitation?

The advantages of spiral/helical CT when compared to conventional CT scanning is/are…

1. Reduces the misregistration artifacts
2. Reduced scan time
3. A decrease in patient dose

The axial plane, also referred to as the transverse or horizontal plane, occurs at a right angle to the sagittal and coronal planes, dividing the body into superior and inferior portions.

In reviewing a CT examination of a chest, the technologist notices a board or flat tabletop beneath the patient. This indicates what type of CT study?

The difference in an analog signal and a digital signal is…

To increase the average photon energy of the CT x-ray beam which of the following must be increased?

CT images containing areas of abrupt changes in tissue density are electronically represented by…

The measurement or scan data comes from the…

What is indicated by the arrow in the image?

The dose experienced by the pituitary gland from a typical CT brain examination would be approximately…

The renal function of a patient can be evaluated with the following laboratory value(s).

When a patient is to receive iodinated contrast media the technologist should ask which of the following questions?

1. Allergic history
2. Renal function
3. Cardiac history

To place the tourniquet in the correct position for the preparation of the patient for intravenous contrast administration, it should be:

Of the following areas of the head, which commonly become calcified due to pathology and the aging process?

1. Pineal gland
2. Choroid plexus
3. Thalamus

The sagittal plane divides the body into anterior and posterior portions while the coronal plane divides the body into right and left portions.

Of the four statements listed below, which is false in regards to the pituitary gland?

A voxel with an attenuation coefficient less than water is assigned a pixel value with a(n) _____________ CT number.