What Is Slip Ring Technology

A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals.

What is slip ring technology in CT?

Slip-ring functions to allow the transfer of electrical information and power between a rotating device and external components. They are used in helical CT and MRI scanners among other applications; in this setting, they allow image acquisition without progressive twisting of cables as the scanner rotates.

What does a slip ring do?

A slip ring passes electrical signals and power across a rotating interface using sliding electrical contacts. These contacts are typically a rotating ring and a stationary brush, or wiper, that slides along the ring surface during rotation.

What is the importance of slip ring in CT scanner?

Slip rings are situated at the diameter of the gantry and contain wire brushes made from conductive material which carry the electrical supply required for the scanner to operate. Slip rings provide continuous rotation of the gantry through eliminating the need for long high-tension cables to the X-ray tube.

What is the use of slip ring induction motor?

A slip ring induction motor is capable of maintaining the highest torque at any slip. Even a high braking torque can be maintained easily. It is mainly used for high starting torque which makes use of an external resistance. They can help in speed control for lifts, railway traction, elevators, etc.

Which scanner is based on slip ring technology?

CT scanners use slip-ring technology, which was introduced in 1989. Slip-ring scanners can perform helical CT scanning, in which the x-ray tube and detector rotate around the patient’s body, continuously acquiring data while the patient moves through the gantry.

What is helical CT?

Listen to pronunciation. (HEE-lih-kul kum-PYOO-ted toh-MAH-gruh-fee) A procedure that uses a computer linked to an x-ray machine to make a series of detailed pictures of areas inside the body. The x-ray machine scans the body in a spiral path.

What is the difference between slip rings and commutators?

The main difference is that commutator is used for the conversion of AC to DC. Slip rings are used in AC motors to provide a continuous transfer of power whereas the commutators are used in DC motors to reverse the polarity of the current in the armature windings.

Is slip ring and commutator the same thing?

Physically, a slip ring is a continuous ring, whereas a commutator is segmented. Functionally, slip rings provide a continuous transfer of power, signals, or data. Commutators, on the other hand, are used in DC motors to reverse the polarity of current in the armature windings.

Why do we use slip rings in AC generator?

The function of slip ring in an AC generator is that these are the hollow rings that are connected to the ends of the armature coil. They help in rotation of the coil. Also, they provide electric contact with the brushes. It acts as a bridge between a still component and a rotating element.

Which of the following is a limitation of computerized tomography?

Disadvantages of computerised tomography scanning CT scans of the brain can be affected by bone nearby. High doses of radiation are involved in CT scanning – chest CT scan is equivalent to 350 chest X-rays; CT abdomen to 400 chest X-rays and CT pulmonary angiography 750 chest X-rays.

What are CT detectors made of?

Individual detector elements are affixed to a circuit board. Solid state crystal detectors are made from a variety of materials, like cadmium tungstate, cesium iodide, bismuth germinate and ceramic rare earth compounds like gadolinium of yttrius.

What is Hounsfield unit in a CT scan?

The Hounsfield unit (HU) is a relative quantitative measurement of radio density used by radiologists in the interpretation of computed tomography (CT) images. The absorption/attenuation coefficient of radiation within a tissue is used during CT reconstruction to produce a grayscale image.

What is slip formula?

If the revolving magnetic flux’s synchronous speed & the speed of rotor are Ns & Nr in the motor, then the speed among them can be equivalent to (Ns – Nr). So, slip can be determined as. S = (Ns – Nr) / Ns.

What are merits and demerits of slip ring induction motor?

Speed regulation is poor when operated with external resistances in rotor circuit. Efficiency and power factor of slip ring motor is lower compared to squirrel cage induction motor. Lower power factor at the light loads. Sensitivity to fluctuations in supply voltage.

What is slip in machine?

In an electrical coupling, slip is defined simply as the difference between the speeds of the two rotating members. In an induction motor, slip is a measure of the difference between the machine’s synchronous speed and its shaft speed.

What controls slice thickness in CT scanning?

Slice thickness is determined by the detector width and pitch, while reconstruction interval can be chosen arbitrarily. The narrower the reconstruction interval, the better 3-D reconstructions.

What is pitch in CT scan?

The term detector pitch is used and is defined as table distance traveled in one 360° gantry rotation divided by beam collimation ². For example, if the table traveled 5 mm in one rotation and the beam collimation was 5 mm then pitch equals 5 mm / 5 mm = 1.0.

What is filter in CT scan?

Filters are metal sheets placed in the x-ray beam between the window and the patient that are used to attenuate the low-energy (soft) x-ray photons from the spectrum.

What type of CT is used for PE?

A commonly used test to diagnose PE is a CT pulmonary angiogram (CTPA).

What are the types of CT scan?

CT Angiography. CT Scan Arthrography. CT Scan Bones. CT Scan Brain/ CT Scan Head.CT Scan Abdomen An abscess in the abdomen. Inflamed colon. Colon cancer. Diverticulitis. Appendicitis.

What is a disadvantage of CT scan technology?

In general, a CT scan has the advantage of short study time (15 to 20 minutes) with high quality images. However, disadvantages include the need for ra- diation exposure and the use of a contrast material (dye) in most cases, which may make it inappropriate for patients with significant kidney problems.