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| Front | Back |
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Which of the following anatomic structures are included in the mediastinum?
1. Stomach
2. Superior vena cava
3. Ascending aorta
A)2 only B)1 and 2 only C)2 and 3 only D)1,2, and 3 |
Answer: C 2 and 3 Only
*2 and 3 are correct. The mediastinum is located in the space between the two lungs. Contained within the mediastinum is the heart, great blood vessels, thymus and portions of the trachea and esophagus. |
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To rule out intervertebral disk herniation, a CT examination using which of the following slice widths and incrementation is best?
A)5x5 B)5x7 C)3x3 D)10x10 |
Answer: B
*3 x 3 mm is correct. The use of small slice thickness and contiguous acquisition is preferred. |
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The vertebral level at which the adult spinal cord ends is...
A)Level of L1 - L2 B)Level of Tll - T12 C)Superior portion of the coccyx D)Level of L3 - L4 |
Answer: A
*The adult spinal cord ends between L1 and L2. |
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A complication following CT-guided needle biopsy of the lung is...
A)Pneumoconiosis B)Aspiration C)Pulmonary embolism D)Pneumothorax |
Answer: D
*One of the most common complications from guided needle biopsy of the lung is pneumothorax. Pneumothorax refers to a collection of air in the pleural space. |
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Name a condition that is usually a sign/symptom of renal failure marked by an excessive amount of nitrogenous waste in the blood.
A)Axotemia B)Oliguria C)Diuresis D)Hydronephrosis |
Answer: A
*Axotemia also called uremia is a condition of excessive nitrogenous waste in the blood, usually occurring during chronic renal failure. |
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An enema containing positive contrast material administered into the large bowel is needed prior to the CT examination of the pelvis. Of the following, which is a sufficient dose to opacify the rectosigmoid area of the colon?
A)A dose of 150 - 250 mL B)A dose of 300 - 500 mL C)A dose of 500 - 750 mL D)A dose of 900 1100 mL |
Answer: A
*To opacify the rectosigmoid region, a dose of 150-250 mL is sufficient. To opacify the complete large bowel a dose of 300 - 500 mL is needed. |
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Listed below are several contrast media. Which may be used during a CT examination of the gastrointestinal tract?
1. Diatrizoate meglumine (Gastrografin) 2. Effervescent agents 3. Iopamidol (Isovue) A)1 only B)  1 and 3 only C)2 and 3 onlyD)1, 2, and 3 |
Answer: D
All three are correct. The use of intravenous contrast agents such as gastrografin and Isovue are necessary to properly visualize the blood vessels and are helpful in the differentiation of mass vascularity. Effervescent agents aid in proper gastric distension. * |
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The total length of a CT scan may be calculated by multiplying the scan time by the aperture size.
True or False |
Answer: True
*An example: If the scan time is 15 seconds and the aperture size(slice thickness) is 1.0cm(10mm) the length of the scan will be 150mm. |
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A CT of the pelvis is acquired using an aperture size of 1.0cm and a scan time of 15 seconds , the resulting slice thickness will equal 10mm.
True or False |
Answer: True
*The aperture size determines the slice or section thickness. Scan time has no affect on the slice thickness. |
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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.
True or False |
Answer: False
*Cerebrospinal fluid contained in the posterior horn of the lateral ventricle does not enhance with the administration of contrast material. A good blood supply as found in the cranial blood vessels, choroid plexus, and dura mater enhance well during a contrast study of the brain. |
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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.
True or False |
Answer: False
*Dynamic is the term used to describe a rapid scan speed with minimal interscan delays. Rapid sequence scanning allows for acquisition of data during peak contrast enhancement phase. |
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An abnormal density of the liver is found to be a fatty infiltrate. The CT number for this area would most likely be in the range of -100 Hounsfield units.
True or False |
Answer: True
*Fatty infiltrates greatly reduce the density of the liver. The minimal attenuation of fat results in a low CT number value in the range of -100 Hounsfield units. |
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High-resolution CT is a specialized technique which uses narrow section widths and a low-resolution algorithm for image reconstruction.
True or False |
Answer: True
*High resolution CT is used to maximize detail of high spatial frequency tissue, this includes tissues of the lungs and bony structures. This specialized technique incorporates narrow section widths and a high-resolution algorithm for image reconstruction. |
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For a three-dimensional disarticulation study of the hip, small overlapping section widths and a SFOV (small scan field of view) produce the best quality image.
True or False |
Answer: False
*To increase the total volume of information used to construct the three-dimensional model, narrow over-lapping sections must be used. The use of a small scan field of view in an area of the hip will cause an out-of-field artifact. |
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Non-ionic contrast media include iopamidol, iohexol, and iodamide.
True or False |
Answer: False
*Non-ionic contrast media include: iopamidol (Isovue), Iohexol (Omnipaque), and iopromide (Ultravist). |
