Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Power Factor Correction01:20

Power Factor Correction

549
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
549
Ionization Energy03:12

Ionization Energy

43.5K
The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
43.5K
Distance Corrections01:15

Distance Corrections

299
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
299
Factors Affecting Solubility04:01

Factors Affecting Solubility

37.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
37.2K
Chambers of the Heart01:16

Chambers of the Heart

10.6K
The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
Deoxygenated blood from the body is received in the right...
10.6K
Transcription Factors02:16

Transcription Factors

82.9K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
82.9K

You might also read

Related Articles

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

Sort by
Same author

A commemoration and appreciation of Professor Ben Mijnheer.

Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology·2026
Same author

The role of diffusion-weighted MRI in biological image-guided radiation therapy: a roadmap.

Physics in medicine and biology·2026
Same author

Leveraging large language models to populate structured clinical case report forms from unstructured medical notes in radiation oncology.

Clinical and translational radiation oncology·2026
Same author

Integrating biomarker-derived individual treatment response assessment into Bayesian trial design for personalized cancer treatment.

Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology·2026
Same author

Maintaining quality of scientific peer-review and publishing in <i>Physics and Imaging in Radiation Oncology</i>.

Physics and imaging in radiation oncology·2026
Same author

Study of the over-response of radiochromic films in ultra-high dose rate and dose per pulse electron beams.

Physics in medicine and biology·2026

Related Experiment Video

Updated: Feb 10, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

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

Published on: May 9, 2014

12.2K

Ionization chamber correction factors for MR-linacs.

Stefan Pojtinger1, Oliver Steffen Dohm, Ralf-Peter Kapsch

  • 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany. Section for Biomedical Physics, Department of Radiation Oncology, University Hospital Tübingen, Tübingen, Germany.

Physics in Medicine and Biology
|May 16, 2018
PubMed
Summary

Magnetic fields affect ionization chamber readings used in magnetic resonance guided radiotherapy (MRgRT). This study quanties the magnetic field correction factor (kB) for accurate dosimetry in MRgRT.

More Related Videos

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
08:30

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation

Published on: August 14, 2017

11.8K
Sample Preparation for Probe Electrospray Ionization Mass Spectrometry
05:47

Sample Preparation for Probe Electrospray Ionization Mass Spectrometry

Published on: February 19, 2020

10.0K

Related Experiment Videos

Last Updated: Feb 10, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

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

Published on: May 9, 2014

12.2K
Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
08:30

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation

Published on: August 14, 2017

11.8K
Sample Preparation for Probe Electrospray Ionization Mass Spectrometry
05:47

Sample Preparation for Probe Electrospray Ionization Mass Spectrometry

Published on: February 19, 2020

10.0K

Area of Science:

  • Medical Physics
  • Radiotherapy Dosimetry
  • Magnetic Resonance Imaging

Background:

  • Ionization chambers are crucial for radiotherapy dosimetry.
  • Magnetic fields in MRgRT systems can influence ionization chamber readings.
  • A correction factor (kB) is needed for accurate dosimetry in MRgRT.

Purpose of the Study:

  • To systematically investigate the magnetic field correction factor (kB) for ionization chambers.
  • To evaluate kB across various magnetic field strengths and chamber types.
  • To provide data for reference dosimetry in MR-guided radiotherapy.

Main Methods:

  • Utilized EGSnrc Monte Carlo simulations for eight commercial ionization chambers.
  • Investigated magnetic flux densities ranging from 0 to 2.5 T.
  • Experimentally validated simulations using a PTW30013 Farmer-type chamber up to 1.425 T.

Main Results:

  • Observed changes in detector response up to 8% due to magnetic fields, chamber geometry, and orientation.
  • Experimental validation showed less than 2% deviation compared to simulations.
  • Determined specific kB values for MR-linac systems (ViewRay MRIdian and Elekta Unity).

Conclusions:

  • Simulated results for thimble-type chambers align well with experimental data and previous studies.
  • The findings support the use of kB for accurate reference dosimetry in MRgRT.
  • Further experimental validation is recommended for establishing standard protocols.