Procedure Cross Sectional CT/MRI PT 1

Fewer shades of gray -shorter gray scale and high contrast

Beam shaping filters are designed to

Which is the largest bundle of white matter found between the cerebral hemispheres?

Involves the sequencing generation of xrays, turning the detectors on and off at appropriate intervals, transfering data

Adjusted by windowing, changing window width and window level

Rotated simultaneously and >750 detectors arranged in a curved detector. Scan times reduce to .35-1 sec per slice.

Which of the follwoing statements are true about subarachnoid cisterns? Choose all that apply

Which sinus empties into the internal jugular veins?

Which vertebra are larger and have greater range of motion ?

Number used to describe average density of tissue

CT scanner x-ray tube voltage range from __ to ___ kilovolts(kV)

Process used to generate 3D images that show the surface of the 3D object

The superior portion of the hypogastric region begins at the :

A circular decide that houses the xray tube,DAS, and Detectors array

Depends on the millions of mathematic operations required to digitize and reconstruct the raw data

Which generation of CT scanners is associated with the term EBCT and the use of electron beam guns?

Ability to freeze any motion of a scanned object

Identify the body plane

WHich anatomical landmark can help locate the brachial plexus?

Which anatomical landmark can medical personnel damage during cardiopulmonary resuscitation by applying direct pressure?

Which meningeal layer forms sheet like folds, or reflections that divide portions of the brain?

Spiral helical CT scanning is based on:Choose all that apply

The term translation is associated with ___ generation scanners? Choose all that apply

Describes the fraction of the beam of xrays or gamma rays that is absorbed/ scattered per unit thickness or the absorber

What are the advantages of cross sectional imaging

Which dural reflection forms a roof over a depression in the sphenoid bone?

Which of the follwoingn are advantages of cross-sectional imaging? Chose all that apply

Which level coincides with the iliac crest in most patients?

Information obtained by radio reception of the MRI signal as stored by a computer.

Pineal gland is an endocrine structure just posterior to the third ventricle. Calcifications is a finding on CT scans.

Second generation scanning employed

Rotate only movement; tube rotates around the patient , detectors are fixed; higher pt dose bc tube is closer to patient

In multislice CT scanners, detectors systems with equal size detectors elements are called ____ arrays.

WHich of the follwoing terms is associated with the seventh generation spiral helical technology? Choose all that apply

CT imaging uses Hounsfield units to indicate the sahdes of gray. Which substance is defined as zero on that scale?

Which of the follwoing types of scanners used water bags?

What is the term for a volumetric picture element that is equal in size in all dimesnsions?

Which of the follwoing structures is not a part of the midbrain?

PatientIV contrast is:

due 2 cerebral volume, temporal horns of the lat. vent. are usually larger & visible anteriorly in older pt vs young pts

detectors measure the transmitted xray values and converts them into electrical signals & relays signal to computer.

Which generations of CT scanners was the first to use a curved array of rotation detectors?

from inferior to superior, what are the parts of the brainstem?

The image on the left is

Ability to see the difference between two objects that are close together and is determined by the degree of blur

A CT gantry includes all of the follwoig components except

In CT, Oral contrast is 3% barium mixture

HIgh speed bc of milliseconds quisition time. uses EBCT. Xrays are produces by electron beam with fam beam configuration

One individual cell surface witin an image matrix used for image display

HIgh speed bc of milliseconds quisition time. uses EBCT. Xrays are produces by electron beam with fam beam configuration

IN sixth generation CT scanners, which of the following elements rotate around the patient? choose all that apply

The range of CT numbers that are used to map signals into shades of gray

The central portion of the lateral ventricle is called?

Which of the following sources of radiation were used in Hounsfields first primitive CT scanner

The addision planes are used to classify and subdivide the

Identify the body plane

Nutating refers to the process of:

The image on the right is

More shades of gray, longer gray scale and low contrast

Has a fan beam and 30 detectors, rotated 10 degrees.

Post processing technique applied to raw data from 2D images to create 3D images

First generation CT scanners used ____ beam scanning

When image data is acquired by a CT scanner, it goes through a process known as?

Blood from veins that drain the arious deep structures of the brain flow into the great cerebral vein of Galen and drain

Has a pencil beam and 1-3 detectors, rotated 1 degree

Detectors are like DR

FOurth generation scanners employed detectors that were:

Individual pixel with associated volume of tissue based on the slice thickness

What is the muscular valve that separates the stomach from the duodenum

The range of xray intensities a detector can differentiate

Incorporates the entire volume of data into 3D image by summing the contribution of each voxel

Which cranial nerve is responsible for the parasympathetic innervation of the heart?

Linked to the computer and gantry with weight limits of 450-650

All power to the gantry of a spiral helical CT scanner is conveyed via

Reconstruction of brightness pixel from a stack of image data into 3D image

Area of anatomy displayed on the monitor; can be adjusted to include entire body section or a specific part of anatomy

Reference material for CT is ____________ and is related to the linear attenuation ceofficent of tissue.

Generators are often times located within the gantry. These types of generators are typically:

What are some factors that affect Image Quality ?

HIgh voltage slip-ring technology allows for 360 degrees of rotation

Which of the follwoing arteries arise from the basilar artery? Choose all that apply

Who first described tomographic methods of diagnostic imaging?

What is the primary function of the hypothalamus?

Increased detector rows allow multiple slices in one rotation

In CT, Dose is patient size depenedent

Which closed sterile cavity is centrally located in the thorax, located between the thoracic vertebral column & sternum?

Conversion of the analog signal to a series of digital values by measurment at a set of particular times

What are the two types of detectors ( choose all that apply)

THe process related to the first computed tomography scanner was called:

First generation scanners were only capable of imaging the :

Mathematical formula for calculation made up of individual cells for number assigment

Identify the body plane

CT can differentiat between density differences less than

Determines the midpoint of the range of gray levels to be displayed on a monitor.

Controls subtle gray images w/i a certain width range and ultimately affects the brightness and overall density of imag

THis is what kind of scan of a knee

Which limbic system structures are responsible for smell agression and sexual behavior?

Multisclice scanner with 64 or more detectors uses a cone beam configuration

THis is what kind of scan of a knee

Beam shaping filters are generally composed of : Choose all that apply.