Users Manual Part 6

Clinical User’s Guide

IBA | 47-9|

Volume 1 - Treatment Session

|Part XI

- Patient Positioning and Alignment Calculating Corrections Using adaPT

insight

Registering Images

Note: For more detailed information on how to perform Image Registration, refer to

the adaPTinsight documentation listed in chapter “About this Manual”.

The adaPTinsight’s Image Registration feature fulfills the following functions:

1. Based on the DRRs and DRs, it verifies that the position of the patient in regard

to the equipment matches the treatment plan geometry.

2. It computes a correction that can be applied to ensure correct patient

positioning.

The best match between reference (DRRs) and acquired (DRs) images can be

assessed visually on the interface and is provided by adaPTinsight as a correction

with 6 degrees of freedom that can be sent to third party systems. This correction is

a sequence of translations and rotations that are applied in the order defined in the

IEC-61217 standard

The image registration process is available in two modalities, each one of them

named after the dimensionality of the images involved (radiographs being 2D images

and planning CT and CBCT being 3D images):

1. 2D-3D registration is the position verification and computation of a correction

between planning CT images and acquired radiographs.

2. 3D-3D registration is the position verification and computation of a correction

between planning CT images and CBCT.

Note: The registration step starts after the image acquisition. Its objective is to

obtain the correction that brings the given images to a best spatial alignment. The

quality of the registration should be visually assessed, manually refined, if necessary,

and validated to proceed with the treatment workflow.

WARNING As a Radiation Therapy Technologist (RTT), always monitor the patient

during motion in the CBCT X-ray image acquisition. In case the patient

moves, the RTT shall interrupt the acquisition.

1. The IEC 61217 standard defines the transformation from the IEC-Fix to the

IEC-TTCS coordinate system.