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Volume acquisition scanners are based on: 1. slice by slice data acquisition 2. Slip ring technology 3. continuous rotation of the x-ray tube A. 1 and 2 B. 1 and 3 C. 2 and 3 D. All are correct - correct answersC. 2 and 3 Absorption efficiency refers to how efficiently x-ray photons are captured by the detectors True or false - correct answersTrue In multidetector scanning, which of the following determines slice thickness? A. pre-patient collimators B. post patient collima...

_______ allows us to represent cross-sections of the human body as digital images which can be displayed on computer monitors, and ultimately, on film. - correct answers Computed Tomography _______ images are numerical representations of an object that can be recognized and processed by a computer. - correct answers Digital The first step in generating a digital image of an object is to divide the object into a grid of small regions. Each small region of the grid is known as a picture elem...

Which of the following is a typical protocol for a CT study of the brain for a patient with a history of dizziness? A. 10-mm × 10-mm sections from the skull base to the vertex B. 7-mm × 7-mm sections from the skull base to the posterior fossa C. 2.5-mm × 2.5-mm sections through the posterior fossa, 5 mm × 5 mm to vertex D. 1.5-mm × 1.5-mm sections from skull base to vertex - correct answersC (Patients with histories of headaches and/or dizziness should be evaluated for abnormali...

Indications for CT imaging of the head are: 1. Stroke and cerebral infarction 2. Hemorrhage in the brain substance 3. Chronic subdural hematoma 4. Primary brain tumors are menciona and glioblastoma multiforme - correct answers1, 2, 3, 4 Which of the following conditions relates to a loss of adequate blood supply to a portion of the brain? A. Tumor in the brain stem B. Hemorrhage in the brain substance C. Cerebral infarction D. Meningioma - correct answersC. Cerebral infarction C...

What image axis in CT extends longitudinally through the scanner? - correct answers z-axis What IV contrast injection protocol enables maximum uptake and enhancement of spinal meningiomas? - correct answers150 mL volume, 3 mL/sec, 80 second delay What is the primary objective of a CT guided biopsy of a pulmonary nodule? - correct answers retrieve a tissue sample for histology What way does increasing the mA of a CT procedure affect the energy of characteristic x-ray photons? - correct a...

Abnormalities of the middle and inner ear may be best demonstrated using what size CT sections? - correct answers1-2mm Name three portions of the small bowel. - correct answers Duodenum jejunum ileum A _____is a benign, highly vascular mass commonly found in the liver. - correct answers Hemangioma Simple cysts of the kidney have average attenuation values in the range of? - correct answers0 to +20 hounsfield units The proper scan field of view (SFOV) for a CT of the abdomen of a pati...

What does CT stand for? - correct answers Computed Tomography Describe how a CT scan creates an image - correct answers It uses x-rays. The tube head rotates around the subject creating a slice The end result is a two dimensional picture of the slice True or False--It is ok if the patient is not perfectly straight for a CT - correct answers FALSE!!! What are the 3 different scanning methods for CT? - correct answers Localizer Scan Conventional CT Scan Helical/Spiral CT Scan Descr...

what radiation dose quantity is significantly influenced by the overall length of a CT scan? - correct answers dose length product (DLP) in what way do Compton scattering interactions affect the image quality of a CT scan? - correct answers decreased contrast resolution what liver pathology is commonly observed in CT as multiple hypoattenuating lesions - correct answers liver mets what is the primary indication for a CT colonography with volume rendering (VR)? - correct answers screenin...

Typical protocol for CT-brain for a pt w/ Hx of dizziness - correct answers2.5-mm × 2.5-mm sections through the posterior fossa, 5 mm × 5 mm to vertex What is the scout (localizer) projection used to prescribe an axial CT acquisition of the brain? - correct answersLAT scout Glioma is a general term used to describe a group of primary tumors. Consisting of malignant glial cells, gliomas occur in - correct answersthe brain Which of the following patient positions may have been used to p...

Combining individual detector rows together to form thicker data channels is specifically for: A. High-speed scanning B. High-resolution scanning C. Axial scanning D. Helical scanning - correct answers b. high resolution? what does it mean when there are GAPS in the data? a. reconstructed slice thickness > slice interval b. reconstructed slice thickness < slice interval c. reconstructed slice interval = slice thickness d. reconstructed slice thickness = acquisition sli...

What disease process would demonstrate ring enhancing lesions in the brain on a CT scan? - correct answers Tuberculosis Which of the following is the primary goal of Choosing Wisely campaign? - correct answers Reduction of unnecessary medical procedures What type of contrast protocol would be beneficial for identifying neoplastic lesions? - correct answers slow flow rate, long scan delay Which innovation removed low-energy quanta from the higher spectrum to improve DECT image contrast w...

Polychromatic - correct answers The x ray beam is comprised with photons of varying energies Beam Attenuation - correct answers The phenomenon in which an X-ray beam passing through a structure is decreased in intensity due to interaction with matter In dual source CT tubes are mounted at how many degrees from each other? - correct answers90° SPECT uses what frequency of electromagnetic radiation for radionuclide counts - correct answers Gamma Rays Angulation of the gantry is used F...

What does the filtering in filtered back-projection refer to? - correct answers a mathematical operation For a reduction of tube current by one-half in a CT acquisition with no other parameter changes, what is the outcome? - correct answers decrease in patient does by one-half What is the limiting spatial resolution for a 25 cm field of view and an image matrix of 500 pixels across the field of view for the CT image in lp/cm - correct answers10 Most clinical x-ray CT scanners use what k...

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As part of a public health initiative, a nurse is teaching a group of older adults about ways to promote and maintain their health. Recognizing that the common cold is a frequent source of ailment, the nurse is addressing this health problem. Which of the following teaching points about the common cold is most accurate? A) "You shouldn't be taking antibiotics for a cold until your doctor has confirmed exactly which bug is causing your cold." B) "It's important to both cover yo...

A patient in severe respiratory distress is admitted to the medical unit at the hospital. During the admission assessment of the patient, the nurse should A. perform a comprehensive health history with the patient to determine the extent of prior respiratory problems. B. complete a full physical examination to determine the effect of the respiratory distress on other body functions. C. delay any physical assessment of the patient and ask family members about the patient's history of respir...

Name of the small flap of tissue that covers the air-only passage when we swallow - correct answers Epiglottis The smallest condution passageways in the respiratory system - correct answers Bronchioles The inferior portion of the pharynx - correct answers Laryngopharynx Volume of air that can be forcibly exhaled after maximum inspiration - correct answers Vital capacity The two external openings of the nasal cavity - correct answers Nares Amount of ai that moves in and out of the ...

Dr. Jones prescribes albuterol sulfate (Proventil) for a patient with newly diagnosed asthma. When teaching the patient about this drug, the nurse should explain that it may cause: A Nasal congestion B Nervousness C Lethargy D Hyperkalemia - correct answersB Nervousness Albuterol may cause nervousness. The inhaled form of the drug may cause dryness and irritation of the nose and throat, not nasal congestion; insomnia, not lethargy; and hypokalemia (with high doses), not hyperkalemia. Othe...

What is the function of the sinuses? - correct answers Give resonance to sound As the thoracic cavity increases in size the internal air pressure does what? - correct answers Decreases Alveoli are surrounded by? - correct answers Capillaries The amount of air that cannot be expelled from the lungs and always remains in the lungs is known as: - correct answers Residual volume The close arrangement of alveoli and capillaries allows for? - correct answers oxygen to diffuse from the alve...

The nurse is reviewing a patient's pulmonary function tests. Which of the following best describes functional residual capacity? A. It is the air inspired and expired in one breath. B. It is the air remaining in the lungs after normal expiration. C. It is the maximum amount of air beyond tidal volume. D. It is the amount of air expired forcefully after maximum inspiration. - correct answersB. It is the air remaining in the lungs after normal expiration. The nurse is assessing the patie...