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CT SCAN > CT GENERATIONS > Flashcards

CT GENERATIONS Flashcards

1
Q

CAT

A

Computerized Axial Transverse/ Tomography

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2
Q

o - Hounsfield build a whole body CT SCANNER

A

1975

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3
Q

o 1971: EMI ( ____
Introduced by SIR GODFREY HOUNSFIELD

A

Electrical Musical Instrumentation)

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4
Q

FEATURES if 1ST CT > scanning motion or tube detector movements

A

TRANSLATE- ROTATE

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5
Q

1st CT

Detector & Xray source:
X-ray Beam:
Duration of Scan ( average):

A

Single
Pencil- shaped
25-30 mins

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6
Q

mins to scan one slicein 1st CT

A

3-5

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7
Q

: minute to reconstruct

A

1.5

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8
Q

1st CT SCAN

Number of Slice per rotation:
Motion of Gantry:
Scan Mode: step and shoot scanning
Power Supply: straighten twisted system cables
Characteristics:made up of ____

A

1
Linear and Rotary
Sodium Iodide

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9
Q

1st CT
 ___ translations with __ degree rotation in LINEAR MOTION

A

180
1

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10
Q

2nd Generation
Tube- detector movement:

A

Translate Rotate

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11
Q

2nd CT
introduced by ___ @ Georgetown University in Feb. 1974

A

LEDLEY

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12
Q

2ND CT
the machines utilizes ___ PMT. Complete a scan in only 9 TRANSLATE- ROTATE CYCLE.

A

30

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13
Q

Xray beam shaped of 2nd CT
___ secondd per slice

A

Narrow fan beam
20

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14
Q

___ translations in CT

A

60

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15
Q

No. Of detector in earlier and late version of CT

A

3, 53

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16
Q

3rd generation introduced in year

A

1971

17
Q

3rd generation of CT with ____ shaped beam 40 to 60 deg

A

Fan beam

18
Q

Xtube and detector of 3rd generation

A

Rotate rotate

19
Q

 Larger array of detectors (more than __) were used. Scanning time was reduced to 2 seconds
Of 3rd generation

A

800

20
Q

 Third generation had been proven by the-study of

A

Mathias Meyer

21
Q

 spiral scanning This is the most commonly used method today and takes about __ seconds to image a single slice

A

0.3

22
Q

 DISADVANTAGE: of 3rd generation

A

RING ARTIFACT.

23
Q

Duration of scan
(average): approximately __sec ( 3rd)

A

5

24
Q

4th generation
Year
Scan

A

1976
1

25
Q

Source detector movement of 4th generation

A

Rotate stationary

26
Q

Number of detector ka 4th generation

A

4800

27
Q

Rotation degrees of 3rd generation

A

360

28
Q

Tube detector of 5th generation

A

Stationary stationary

29
Q

EBCT ___ GENERATION

A

5th

30
Q

1990s helical or spiral CT

A

6th generation

31
Q

Slip ring technology
5s rotation scan
More 360 deg

A

6th gen

32
Q

Eliminate 6 scan delayed

A

6th gen

CT SCAN (5 decks)

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