Search research articles

Related Concept Videos

Common Leveling Mistakes and Errors

Common Leveling Mistakes and Errors

A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...

Instrument Calibration

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Changes in bone marrow fat fraction and immune cell counts in women with cervical cancer treated with primary chemoradiotherapy.

Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology·2025

Same author

Intra-prostatic recurrences after radiotherapy with focal boost: Location and dose mapping in the FLAME trial.

Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology·2024

Same author

Future of Multidisciplinary Team in the Context of Adaptive Therapy.

Seminars in radiation oncology·2024

Same author

A DWI-based hypoxia model shows robustness in an external prostatectomy cohort.

Frontiers in oncology·2024

Same author

Validation of quantitative magnetic resonance imaging techniques in head and neck healthy structures involved in the salivary and swallowing function: Accuracy and repeatability.

Physics and imaging in radiation oncology·2024

Same author

Associations between patient-reported late effects and systemic cytokines in long-term survivors of head and neck cancer treated with radiotherapy.

Journal of cancer survivorship : research and practice·2022

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Search research articles

Related Experiment Video

Updated: Jul 17, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

Consequences of leaf calibration errors on IMRT delivery.

M Sastre-Padro¹, J Welleweerd, E Malinen

¹Department of Medical Physics, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway, and Department of Radiotherapy, University Medical Center Utrecht, The Netherlands. maria.sastre@radiumhospitalet.no

Physics in Medicine and Biology

|February 1, 2007

Summary

Small errors in leaf positioning during intensity-modulated radiation therapy (IMRT) can significantly alter treatment doses. Even minor leaf bank positioning inaccuracies impact delivered radiation and may affect patient outcomes.

More Related Videos

Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy

Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy

Published on: May 8, 2018

Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities

Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities

Published on: October 27, 2023

Related Experiment Videos

Last Updated: Jul 17, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy

Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy

Published on: May 8, 2018

Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities

Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities

Published on: October 27, 2023

Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Technology

Background:

Intensity-modulated radiation therapy (IMRT) utilizes multi-leaf collimators (MLCs) to optimize dose delivery and spare organs at risk.
Small MLC segments in IMRT plans can amplify the impact of leaf positioning errors on dose accuracy.

Purpose of the Study:

To investigate the therapeutic consequences of systematic leaf positioning errors in head and neck IMRT treatments.
To quantify the impact of varying leaf pair offset errors on dose discrepancies and treatment plan acceptability.

Main Methods:

Four head and neck IMRT treatment plans were modified with systematic leaf pair offset errors ranging from +/-2.0 mm.
Thirty-six films were irradiated using original and modified IMRT segments.
Dose differences and gamma index (2%/2 mm criteria) were analyzed to evaluate discrepancies.

Main Results:

Median dose differences showed a linear relationship with simulated leaf pair errors.
A 2.0 mm leaf error resulted in a maximum median dose difference of 1.5%.
Gamma analysis indicated that two of the 32 modified plans were unacceptable.

Conclusions:

Small systematic leaf bank positioning errors in IMRT have a measurable impact on delivered radiation dose.
These positioning inaccuracies can potentially affect the therapeutic outcome of IMRT treatments.
Ensuring accurate MLC leaf positioning is critical for maintaining IMRT plan integrity and efficacy.