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Linear time-invariant Systems

Linear time-invariant Systems

A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
The input-output behavior of an LTI system can be fully defined by its response to an impulsive excitation at its input. Once this impulse response is known, the system's reaction to any other input can be...

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Related Experiment Video

Updated: Feb 26, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

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Published on: May 9, 2014

Current Status of MR-Linac System.

Noriyuki Kadoya¹

¹Department of Radiation Oncology, Tohoku University School of Medicine.

Igaku Butsuri : Nihon Igaku Butsuri Gakkai Kikanshi = Japanese Journal of Medical Physics : an Official Journal of Japan Society of Medical Physics

|July 14, 2017

Summary

This summary is machine-generated.

This report details the development and advantages of Magnetic Resonance Linear Accelerators (MR-Linac) for radiotherapy. It explains the electron return effect and its impact on dose distribution, aiding system comprehension.

Keywords:

MR-Linac radiotherapy

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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

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Published on: May 9, 2014

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Area of Science:

Medical Physics
Radiation Oncology
Biomedical Engineering

Background:

The evolution of radiotherapy has led to advanced imaging and treatment integration.
Magnetic Resonance Linear Accelerators (MR-Linac) represent a significant advancement in precision radiotherapy.

Purpose of the Study:

To provide an overview of the current status and developmental history of MR-Linac systems.
To elucidate the benefits of MR-Linac technology in radiotherapy applications.
To explain the physics behind the electron return effect in MR-Linac and its influence on dose distribution.

Main Methods:

Historical review of MR-Linac development.
Discussion of MR-Linac advantages in radiotherapy.
Explanation of the electron return effect and its impact on dose calculation.

Main Results:

MR-Linac systems offer enhanced capabilities for radiotherapy.
The magnetic field in MR-Linac induces an electron return effect.
This effect alters dose distribution compared to non-MR-guided systems.

Conclusions:

Understanding the electron return effect is crucial for accurate dosimetry in MR-Linac therapy.
MR-Linac technology holds significant promise for improving radiotherapy outcomes.
This explanation facilitates a deeper understanding of MR-Linac system functionality.