The effects of CT x-ray tube voltage and current variations on the relative electron density (RED) and CT number conversion curves

Based on Pauling's nature of chemical bond, the valence electron structures of TiN and FeAl have been constructed, and the relative electron density differences (REDD) between the low index plane of TiN and FeAl , respectively, have been calculated. [110] FeAl //[110] TiN crystallography orientation has been set up from the minimization of the electron density difference across the interface. From the viewpoint of improving the mechanical properties of composites, the formation of such structures must been engineered in the fabrication processing.

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Relative electron density calibration of CT scanners for radiotherapy treatment planning.

British Journal of Radiology ◽

10.1259/bjr.72.860.10624344 ◽

1999 ◽

Vol 72 (860) ◽

pp. 781-786 ◽

Cited By ~ 79

Author(s):

S J Thomas

Keyword(s):

Treatment Planning ◽

Electron Density ◽

Radiotherapy Treatment Planning ◽

Relative Electron Density ◽

Relative Electron ◽

Ct Scanners ◽

Radiotherapy Treatment

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SU-E-T-530: Relative Electron Density Phantom Comparison

Medical Physics ◽

10.1118/1.4735619 ◽

2012 ◽

Vol 39 (6Part18) ◽

pp. 3827-3827 ◽

Cited By ~ 1

Author(s):

B Rasmussen ◽

K Chu ◽

S Tong

Keyword(s):

Electron Density ◽

Relative Electron Density ◽

Relative Electron

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SU-E-T-599: The Variation of Hounsfield Unit and Relative Electron Density Determination as a Function of KVp and Its Effect On Dose Calculation Accuracy

Medical Physics ◽

10.1118/1.4888935 ◽

2014 ◽

Vol 41 (6Part21) ◽

pp. 365-365

Author(s):

A Ohl ◽

S De Boer

Keyword(s):

Electron Density ◽

Dose Calculation ◽

Hounsfield Unit ◽

Density Determination ◽

Relative Electron Density ◽

Relative Electron

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SU-F-I-24: Feasibility of Magnetic Susceptibility to Relative Electron Density Conversion Method for Radiation Therapy

Medical Physics ◽

10.1118/1.4955852 ◽

2016 ◽

Vol 43 (6Part7) ◽

pp. 3392-3392

Author(s):

K Ito ◽

N Kadoya ◽

M Chiba ◽

K Sato ◽

T Nagasaka ◽

...

Keyword(s):

Magnetic Susceptibility ◽

Radiation Therapy ◽

Electron Density ◽

Conversion Method ◽

Relative Electron Density ◽

Relative Electron

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The effect of silver sulfadiazine and zinc oxide creams on dose distribution during radiotherapy.

Journal of Radiotherapy in Practice ◽

10.1017/s1460396914000533 ◽

2015 ◽

Vol 14 (2) ◽

pp. 111-116 ◽

Cited By ~ 2

Author(s):

D. Fackrell ◽

D. Kirby ◽

P. Sanghera ◽

A. Hartley

Keyword(s):

Zinc Oxide ◽

Dose Distribution ◽

Evidence Base ◽

Silver Sulfadiazine ◽

Dose Effect ◽

X Ray ◽

Relative Electron Density ◽

Relative Electron ◽

Dose Measurements ◽

Dose Difference

AbstractIntroductionThe use of metallic containing creams to prevent and treat radiodermatitis is controversial and lacking evidence base. We compare the dose effect of two metallic-based skin creams, which could be used for treating radiodermatitis, to a control.MethodologyUniversal containers of silver sulfadiazine cream, zinc oxide cream and aqueous cream were examined using a computed tomography scanner to assess their electron densities relative to water. Second, each cream was exposed to 100 kV and 6 MV photons. The relative doses were measured using an X-ray chamber.ResultsThe relative electron density measured was similar for the silver sulfadiazine and aqueous creams. Zinc oxide was 40% higher. The relative dose measurements showed that silver sulfadiazine behaved in a similar way to aqueous cream; however, zinc oxide cream exhibited a dose difference of 11·0% in kV photons and −4·1% in MV photons.ConclusionApplication of silver sulfadiazine appears unlikely to bring about significant changes in the dose distribution when compared with aqueous during MV or kV radiotherapy. While zinc oxide cream brought about more significant dose changes.

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Body size and tube voltage dependent corrections for Hounsfield Unit in medical X-ray computed tomography: theory and experiments

Scientific Reports ◽

10.1038/s41598-020-72707-y ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Xiaoming Zheng ◽

Yazan Al-Hayek ◽

Chris Cummins ◽

Xiaotian Li ◽

Laura Nardi ◽

...

Keyword(s):

Body Size ◽

Hounsfield Unit ◽

Bulk Water ◽

Tube Voltage ◽

Ct Number ◽

X Ray ◽

Correction Scheme ◽

Voltage Dependent ◽

Body Sizes ◽

X Ray Computed

Abstract The purpose of this work is to present a body size and tube voltage dependent correction scheme for the Hounsfield Unit, HU, in medical X-ray Computed Tomography imaging. Boltzmann photon transport equation was employed to study X-ray interaction with bulk water in CT imaging. Experimentally measured X-ray output in body of phantoms and attenuation cross sections of water were employed in the derivation of beam intensity in X-ray imaging. A Somatom Emotion CT scanner from Siemens and electron density phantoms from CIRS were employed to acquire CT images of different body sizes and different tissue materials located at different depths from body’s surface. Tube voltage and depth dependent effective attenuation of bulk water was found from theoretical analysis in agreement with measured size-specific correction factors for CTDIvol under different tube voltages. A size and tube voltage dependent correction scheme for the Hounsfield Unit is established. For the same tissue material, body size has much larger impact on the CT number variations than that of depth from the body surface in phantom measurements. Good results were achieved by applying the established correction scheme on the experimentally measured CT number variations under different tube voltages and body sizes.

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