CT generations

1st generation was known as

Computerized transverse axial scanner

Second-generation scan time

10 to 90 seconds

Average time for scan in first generation

4.5 to 5 minutes Had consisted of 10 to 12 sections which required 25 to 35 min exam time

Pitch is common to what CT generation

6th and 7th

What was the third generation detector range

250 to 750

Which generation added a mask and what type of mask was it?

2nd generation and a lead mask to absorb some of the scatter

Primary difference between x-ray tube used in CT to x-ray tubes in radiography

CT -handles more heat and smaller focal spot that use a pulsed beam

Predetector collimators functions

Called collimator mask reduce scatter enhances contrast determine slice thickness

Electron beam technology differences from 1st through 4th generation

Cardiac only no moving parts live as it is happening No x-ray tube

What made third-generation different from first and second

Continual motion without stopping to translate Entire body scan 360° rotation Scan take one to two seconds

Pre-patient collimators function

Determine patient dose and adjust to slice thickness selected

Fifth generation Contrast injection synchronized with what on patients

ECG

Fifth-generation CT were called

Electron beam Tomography or cardiac Cine

Definition of pitch

Extension or contraction of the helix

Second-generation major differences from first

Fan beam so has more detectors larger rotation

Which generation is like a Polaroid camera

First generation

MDCT stands for ---- and what does it aquire

Multi detector CT Provides a motion free high,resolution images and it aquires volume data rather than slice

MSCT stands for --- and resolution is determined by ---

Multi slice and width of detector

Does the 6th Generation CT table index

No, it moves in and out with a smooth motion

1st generation translation and type of beam

Pencil been The unit translates or sweeps across patient source detector assembly returns to his starting position and entire assembly then rotates around patient moves 1° out a time

Third-generation was prone to what type of artifacts

Ring

3rd-generation had a ___ to ___type of configuration

Rotate to rotate

Advantages of 6th generation

Scan time improvements lower dose of contrast patient continually advance through bore *Only one breath hold during exam

Advantages/changes of 7th generation

Shorter scan times artifacts reduced multisection or multi slice Improved spatial resolution due to thinner slices Improve the image quality for angiography 3D multiplanar reconstruction

First generation

Single x-ray tube and pair of detectors or a line on a C-arm x-rays passed through patient and water bag before being absorbed by the detectors on the other side

What made spiral/helical CTpossible and what did it eliminate

Slip ring technology Power cables

Spiral/helical CT scan is based on what type of technology and acquisition?

Slip ring technology and volume data acquisition

7th generation is known as

Spiral/helical CT

Fourth-generation had what type of detector configuration and xray rotation

Stationary - (600 to 2000 stationary detectors) and xray rotated

Second-generation used what type of configuration

Translate and rotate

Definition of translate

Translate means rotate motion side to side

What rotated on the fourth generation

X-ray source