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PROXIMITY DETECTION FEEDBACK FOR COMPUTED TOMOGRAPHY COLLIMATOR

IP.com Disclosure Number: IPCOM000239115D
Publication Date: 2014-Oct-13
Document File: 4 page(s) / 58K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique for acquiring proximity detection feedback for computed tomography (CT) collimator. The technique includes a proximity sensing element used in conjunction with a multi-axis motion control solution. The sensing element detects explicit part presence at the area of interest rather than relying on implicit means of feedback. The element ties into a controlling logic to provide redundant feedback for increased fault detection.

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PROXIMITY DETECTION FEEDBACK FOR COMPUTED TOMOGRAPHY COLLIMATOR

FIELD OF INVENTION

The invention generally relates to computed tomography collimator and more particularly to a technique for acquiring proximity detection feedback for CT collimator.

BACKGROUND OF THE INVENTION


In motion systems, primary feedback methods such as encoders are often employed to create closed-loop systems. More recently, motor manufacturers offer integrated encoders in their motors as design solutions. Such systems with integral encoders or other rotary encoding systems are limited in that they can only implicitly measure position of a linearly moving system by measuring the rotary position. In CT collimator applications, rotational motion of a motor is converted into linear motion of components. In order to explicitly measure linear position of these parts, linear feedback methods are required which are expensive and space consuming. The risk of using only implicit rotary measurement is that if a component within a drive chain fails, for example, a coupling or a nut stripping, rotary position feedback is no longer accurate to the linear position. In some applications, this inaccuracy poses as a safety risk.

BRIEF DESCRIPTION OF THE INVENTION

The invention proposes a technique for acquiring proximity detection feedback for computed tomography (CT) collimator. The technique includes a proximity sensing element used in conjunction with a multi-axis motion control solution. The sensing element detects explicit part presence at the area of interest rather than relying on implicit means of feedback. The element ties into a controlling logic to provide redundant feedback for increased fault detection.

DETAILED DESCRIPTION OF THE INVENTION

The invention proposes a technique for acquiring proximity detection feedback for computed tomography (CT) collimator. The technique includes a proximity sensing element used in conjunction with a multi-axis motion control solution. FIG. 1 depicts drive chain arrangement that includes a motor, a drive screw, and a linear moving object.

FIG.1

The redundant proximity sensing ele...