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USE OF A DOCKABLE C-ARM X RAY IMAGER WITH A LINEAR ACCELERATOR FOR IMAGE-GUIDED RADIOTHERAPY

IP.com Disclosure Number: IPCOM000011541D
Publication Date: 2003-Feb-28
Document File: 4 page(s) / 125K

Publishing Venue

The IP.com Prior Art Database

Related People

Michelle Svatos: INVENTOR

Abstract

A MOBILE C-ARM X-RAY IMAGER WITH A DOCKING MECHANISM IS PROPOSED FOR USE IN A RADIOTHERAPY TREATMENT VAULT. THE C-ARM IS DOCKED NEAR THE FOOT OF THE LINEAR ACCELERATOR TREATMENT TABLE SO AS NOT TO INTERFERE WITH THE CLEARANCE REQUIRED FOR THE LINAC. TO IMAGE, THE COUCH IS DRIVEN TO A CONSTANT LONGITUDENAL OFFSET, THE IMAGE IS TAKEN. CT RECONSTRUCTION MAY BE USED TO OBTAIN A 3D DATA SET. THE TABLE IS MOVED BACK TO THE TREATMENT POSITION AND CORRECTIONS ARE MADE TO THE POSITION BASED ON ANATOMICAL INFORMATION. THE TREATMENT MAY PROCEED WITH THE C-ARM IMAGER IN THE ROOM OR IT MAY BE DISENAGED AND MOVED INTO A CORNER OF THE ROOM OR MOVED OUT COMPLETELY.

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Michelle Svatos

Siemens Medical Systems, Inc.

Oncology Care Systems Group

JULY 2002

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INVENTION DISCLOSURE

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USE OF A DOCKABLE C-ARM X RAY IMAGER WITH A LINEAR ACCELERATOR FOR IMAGE-GUIDED RADIOTHERAPY

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ABSTRACT

A MOBILE C-ARM X-RAY IMAGER WITH A DOCKING MECHANISM IS PROPOSED FOR USE IN A RADIOTHERAPY TREATMENT VAULT. THE C-ARM IS DOCKED NEAR THE FOOT OF THE LINEAR ACCELERATOR TREATMENT TABLE SO AS NOT TO INTERFERE WITH THE CLEARANCE REQUIRED FOR THE LINAC. TO IMAGE, THE COUCH IS DRIVEN TO A CONSTANT LONGITUDENAL OFFSET, THE IMAGE IS TAKEN. CT RECONSTRUCTION MAY BE USED TO OBTAIN A 3D DATA SET. THE TABLE IS MOVED BACK TO THE TREATMENT POSITION AND CORRECTIONS ARE MADE TO THE POSITION BASED ON ANATOMICAL INFORMATION. THE TREATMENT MAY PROCEED WITH THE C-ARM IMAGER IN THE ROOM OR IT MAY BE DISENAGED AND MOVED INTO A CORNER OF THE ROOM OR MOVED OUT COMPLETELY.

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INTRODUCTION

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BACKGROUND OF THE INVENTION

Conventional radiation therapy typically involves directing a radiation beam at a tumor in a patient to deliver a predetermined dose (1£ therapeutic radiation to the tumor according to an established treatment plan.

The radiotherapy treatment of tumors involves three-dimensional treatment volumes which typically include segments of normal, healthy tissue and organs. Healthy tissue and organs are often in the treatment path of the radiation beam. This complicates treatment, because the healthy tissue andorgans must be taken into account when d.cliveringa dose of radiation to the tumor. While there is a need to minimize. damage to healthy tissue and organs, there is an equally important need to ensure that the tumor receives an adequately high dose of radiation. Cure rates for many tumors are a sensitive function of the dose they receive. It is known that many parts of the body change size and/or shape from day to day, throughout the course of radiotherapy. The treatment plan is made qn a CT scan of the patient's anatomy. therefore, being able to image the position of the planned beam with respect to the patient's exact anaatomy at the time of treatment is very important.

One way to accomplish this is to have a CT scanner in the same room as the treatment linac. This is done today at a few elite centers, with our Primatom product. However there are a number of factors that make this solution impractical for many clinics. First, the product is expensive due to the high cost of the CT scanner and specialized rails. Secondly it requires a large amount of space in the linac vault. Many linac vaults are not designed so large, and alterations are complicated by the need for megavoltage shielding. Finally, thc CT scanner must be kept out of the beam, but it is difficult to move. The Primatom...