CT II

Shanks Redhaired · 7問 · 1年前

通報

問題一覧

This can be done in two successive scans or by switching the high voltage rapidly from projection to projection.

material selective scanning

Geometry systems

long, short

Several factors influences the external dimensions of the CT Gantry:

SID, scan FOV, fan angle

The distance between the x-ray tube and the patient at the isocenter is shorter than long geometry.

short geometry

Improve image blur and decrease radiation dose.

long geometry

Electromechanical device consisting of circular electrical conductive rings and brushes that transmit electrical energy across a rotating interface.

slip ring technology

2 slip ring technology

low voltage, high voltage

Generator in ct

high frequency

Generator is located

inside gantry, in rotating frame, in corner of gantry

Components of generator

full wave rectifier, capacitor, inverter circuit, high voltage transformer, full wave rectifier

X-ray tube assembly

tube envelope, anode, cathode

Anode assembly

target, rotor stud, hub, rotor, bearing assembly

Three types of disks designs for modern x-ray tube in CT scans

conventional all metal disk, brazed graphite disk, chemical vapor deposition graphite anode disk

X-ray tube power capacity:

must be high

Xray tube power capacity kvp ma

>120 kvp, 400 ma

Xray tube High speed rotors

for heat dissipation

Anode heat capacity

7 mhu

Anode heat storage capacity

8 mhu

Xray tube focal spot size

must be small, robust/strong, heat dissipation

X-ray tube life

~5000 exposures

convert alternating current into direct current.

full wave rectifier

a device that has the ability to store energy momentarily

capacitor

assure of flow of electricity within the x-ray generator

inverter circuit

focuses on the voltage area, assures the high amount of voltage that is circulating or flowing in the x-ray generator to sustain the other parts of CT SCANNER. High voltage is required and at the same time direct current.

high voltage transformer

maintainthe consistent current or direct current.

full wave rectifier

Housing that protects the tube

tube envelope

Xray tube 2 major assembly

cathode, anode

When the cathode is activated, there will be intense heating of the filament which lead to the release of electron called the

thermionic emission

area of focal target that is impacted

actual focal spot

actual size or the area ofthe focal spot that is projected out of the tube toward the object being radiograph

effective focal spot

Contain what we call focal spot

target

rotating part of the Anode assembly

bearing assembly

2 types of bearing assembly

ball, liquid

Bearing requires lubrication

ball

continuous supply of gallium liquid-used to lubricate

liquid

projection

projection

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