Magnetophoretic Behavior of Single Polystyrene Particles in Aqueous Manganese(II) Chloride

Watarai, Hitoshi; Namba, Makoto

doi:10.2116/analsci.17.1233

Cited by 67 publications

(57 citation statements)

References 5 publications

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“…On purpose, these were not adjusted precisely but rather used as a clinical reference point and variations are expected since also in clinical routine an exact positioning of the FG at these reference distances is not feasible. The distance d table was varied to 0, 30, 60, 80, 120 mm by placing Styrodur ® pads (

{italicμ}_{r}^{normalPolystyrol} \approx 1 - 8 \cdot 10^{- 6}

,30 according to Eq. (1),

\frac{Δ p}{r_{0}} < 2.7 \cdot 10^{- 6} mm

) under the phantom.…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic tracking (EMT) technology for improved treatment quality assurance in interstitial brachytherapy

Kellermeier

Herbolzheimer

Kreppner

et al. 2017

J Applied Clin Med Phys

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Electromagnetic Tracking (EMT) is a novel technique for error detection and quality assurance (QA) in interstitial high dose rate brachytherapy (HDR‐iBT). The purpose of this study is to provide a concept for data acquisition developed as part of a clinical evaluation study on the use of EMT during interstitial treatment of breast cancer patients. The stability, accuracy, and precision of EMT‐determined dwell positions were quantified. Dwell position reconstruction based on EMT was investigated on CT table, HDR table and PDR bed to examine the influence on precision and accuracy in a typical clinical workflow. All investigations were performed using a precise PMMA phantom. The track of catheters inserted in that phantom was measured by manually inserting a 5 degree of freedom (DoF) sensor while recording the position of three 6DoF fiducial sensors on the phantom surface to correct motion influences. From the corrected data, dwell positions were reconstructed along the catheter's track. The accuracy of the EMT‐determined dwell positions was quantified by the residual distances to reference dwell positions after using a rigid registration. Precision and accuracy were investigated for different phantom‐table and sensor‐field generator (FG) distances. The measured precision of the EMT‐determined dwell positions was ≤ 0.28 mm (95th percentile). Stability tests showed a drift of 0.03 mm in the first 20 min of use. Sudden shaking of the FG or (large) metallic objects close to the FG degrade the precision. The accuracy with respect to the reference dwell positions was on all clinical tables < 1 mm at 200 mm FG distance and 120 mm phantom‐table distance. Phantom measurements showed that EMT‐determined localization of dwell positions in HDR‐iBT is stable, precise, and sufficiently accurate for clinical assessment. The presented method may be viable for clinical applications in HDR‐iBT, like implant definition, error detection or quantification of uncertainties. Further clinical investigations are needed.

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{italicμ}_{r}^{normalPolystyrol} \approx 1 - 8 \cdot 10^{- 6}

,30 according to Eq. (1),

\frac{Δ p}{r_{0}} < 2.7 \cdot 10^{- 6} mm

) under the phantom.…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic tracking (EMT) technology for improved treatment quality assurance in interstitial brachytherapy

Kellermeier

Herbolzheimer

Kreppner

et al. 2017

J Applied Clin Med Phys

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show abstract

“…35,36 The configuration of magnets (Nd-Fe-B) and iron pole pieces is shown in Fig. 12, which could generate a magnetic field gradient toward the flow direction.…”

Section: ·2 Analytical Separation Techniquesmentioning

confidence: 99%

Migration Analysis of Micro-Particles in Liquids Using Microscopically Designed External Fields

et al. 2004

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The recent development of new migration methods of micro-particles in liquids using various external fields is reviewed. The combination of a laser scattering force and a photothermal effect produced photothermal-conversion laserphotophoresis. A dielectric field generated in a planer or a capillary quadrupole electrode realized dielectrophoresis. Using a micrometer-scaled magnetic field gradient, the "Magnetophoretic velocimetry" of micro-particles was invented. Furthermore, the Lorentz force generated by combining an electric field and a magnetic field was utilized for electromagnetophoresis. These new methods were overlooked and the advantages in analytical use were discussed.

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“…21,22 According to Eq. (1), the magnetic susceptibility of a particle, χp, has been determined by measuring the migration velocity and the radius of particles as well as the value of B(dB/dx).…”

Section: Introductionmentioning

confidence: 99%

Zero-velocity Magnetophoretic Method for the Determination of Particle Magnetic Susceptibility

et al. 2014

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A simple zero-velocity method to determine the particle magnetic susceptibility by measuring the magnetophoretic velocity was proposed. The principle is that the magnetophoretic velocity of a particle in a liquid medium must be zero when the magnetic susceptibilities of the medium and the particle are equal, or the gravity force and the magnetophoretic force are balanced. By changing the medium magnetic susceptibility and measuring the magnetophoretic velocity of a particle, the particle magnetic susceptibility was determined from the medium magnetic susceptibility under the zero-velocity condition. The feasibility of the method was demonstrated for polystyrene particles using a Dy(III) solution in the horizontal migration mode and different organic solvents in the vertical migration mode.

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Magnetophoretic Behavior of Single Polystyrene Particles in Aqueous Manganese(II) Chloride

Cited by 67 publications

References 5 publications

Electromagnetic tracking (EMT) technology for improved treatment quality assurance in interstitial brachytherapy

Electromagnetic tracking (EMT) technology for improved treatment quality assurance in interstitial brachytherapy

Migration Analysis of Micro-Particles in Liquids Using Microscopically Designed External Fields

Zero-velocity Magnetophoretic Method for the Determination of Particle Magnetic Susceptibility

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