Dr Frederik Du Plessis
Position
Sr Lect/Sr Manager
Department
Medical Physics
Address
GN
Medical Physics
G 68
Telephone
051 4052698
Office
Information

Short CV

Name: Frederik Carl Philippus du Plessis

Date of birth: 07 September 1969 (Bloemfontein)

Qualifications: Graad12

Degrees:

B.Sc. (1990, Physics and Chemistry)(UFS),

B.Sc. Hons (1992, Medical physics)(UFS)

M.Med.Sc. (2000, Medical Physics)(UFS)

Ph.D. (2004, Medical Physics)(UFS).

Professional registration(s): HPCSA as Medical Physicist

Work experience:

Assistant Medical Physicist, 1992 - 1994

Medical Physicist, 1994-1997

Senior Medical Physicist, 1997- 1999

Principal Medical Physicist, 1999-2002

Chief Medical Physicist, 2002-2004

Control Medical Physicist, 2004

Fox Chase Cancer Center, Post Doctoral Research Associate 2005

Control Medical Physicist: 2006 - current

Acting Senior Manager, 4/2009-06/2009

Committees, 2008 – present , Research committee, 2008 – present , Representative to the Intrumentation and electronics workshop.

Membership of professional organizations - SA Association of Physicists in Medicine and Biology, SA Medical Physics Society, SA Radiation Protection Society. Special recognition and awards: 1997 Merit award (class B)., 2000 Meditech prize for best presentation in computer applications in radiation dosimetry during the 40th annual SAAPMB congress in Durban (June 2000). 2001 Merit award (class A). 2002 Merit award (class A). 2004 Winner of Muller-Potgieter medal in the faculty of Medicine, University of the Free State for most outstanding publication in a non-clinical field. 2004 Co-winner of SABS prize at 44th annual SAAPMB congress in Johannesburg (September 2004). 2006 Winner of ELEKTA prize for best oral presentation at 45th SAAPMB congress in Cape town (March 2006). 2006 Winner of Muller-Potgieter medal in the faculty of Medicine, University of the Free State for most outstanding publication in a non-clinical field. 2006 Runner-up for best paper on laboratory research in the faculty of medicine, University of the Free State. 2006 Performance appraisal. 2007 Performance appraisal. 2007 Winner of Muller-Potgieter medal in the faculty of Medicine, University of the Free State for most outstanding publication in a non-clinical field. 2007 Received NRF grating as Y2 category researcher. 2008 Co-winner of SABS prize at 47th annual SAAPMB congress in Durban (June 2008). 2008 Winner of best senior paper for on laboratory research in the faculty of medicine, University of the Free State. 2008 Winner of the MSD Floating Trophy, in the faculty of medicine, University of the Free State.
Other academic contributions:

Oorsese besoeke / Overseas research visits: Palo Alto, California (USA) November 2000, Fox Chase Cancer Center, Pennsylvania (USA) January – December 2005.

Tree op as eksaminator vir die volgende / Acted as examiner for the following:, PH.D. Thesis for candidate Inyang, Samuel Okon on Monte Carlo Simulation of Irregular Electron Fields Using EGSnrc, 2006.

M. Tech dissertation for candidate Deirdre’ Long on An analysis of dose effectiveness and incidence of lateral rectal complications of high dose-rate brachytherapy in the radical treatment of cervical cancer, 2007

M. Tech dissertation for candidate Marissa Jordaan on An evaluation of two immobilization devices for head and neck radiation therapy at the Universitas annex, Bloemfontein. 2008

M. Tech dissertation for candidate B Kinsella on The development of a radiation quality control manual by analyzing the prevalence of adverse incidents during radiation therapy at the Universitas Annex, Bloemfontein. 2008

PH.D. Thesis for candidate M E Sithole for the PhD degree on ‘The Effect Of Silicone Gel Breast Prosthesis On Photon Dose Distributions’, 2009.

D. Tech dissertation for candidate G J van der Walt on Radiation field shaping through low temperature thermal-spray in radiotherapy, 2009

Tree op as studieliereActed as co- / study leader/promotor for the following:

M.Med dissertation for candidate Willie Shaw on Evaluation of a treatment planning system against Monte Carlo simulated 3D dose distributions, 2004 – 2007

M.Med dissertation for candidate Dedri O’Reilly on Megavoltage image reconstruction using cone beam techniques, 2008 – 2010

Ph.D. thesis for candidate Omer Ali Aziz on characterization of electron beams transported through a photon multileaf collimator for use in optimized modulated electron radiation therapy procedures, ongoing project, 2007 – 2009

D.Tech thesis for candidate J G van der Walt on Radiation field shaping through low temperature thermal spray. 2005 – 2008.

Kongres bydraes / conference contributions:

Bepaling van normale waardes vir radionuklied kardiale funksie-indekse, *PD du Toit, FCP du Plessis, A van Aswegen, AC Otto, SAAPMB congress, May 1993 (Bloemfontein).

Die toepassing van ‘n gehalteversekeringsprogram op diagnostiese X-straal apparate in Bloemfontein, *JA van Staden, FCP du Plessis, MM Calitz, J Marais, NJ Uys, PD du Toit, A van Aswegen, MG Lötter, SAAPMB congress, May 1993 (Bloemfontein).

Reconstruction of linear accelerator megavoltage photon beam energy spectra from transmission data,*FCP du Plessis, CA Willemse, J Duvenage, SAAPMB congress, May 1995 (Capetown).

Reconstruction of 8 MV linear accelerator photon beam energy spectra,*FCP du Plessis, CA Willemse, J Duvenage, Radiotherapy congress, September 1995 (Bloemfontein).

A quality assurance program for radiotherapy at National Hospital, Bloemfontein,*JAH de Lange, FCP du Plessis, JA van Staden, JS Engelbrecht, J Duvenage, CA Willemse, SAAPMB congress, May 1995 (Capetown) and Radiotherapy congress, September 1995 (Bloemfontein).

Gehalte versekering van die Thebes bundelanaliseerder, *F Beeslaar, FCP du Plessis, CA Willemse, SAAPMB congress, May 1996 (Midrand).

The indirect use of CT numbers for the Monte Carlo program DOSXYZ, *FCP du Plessis, CA Willemse, MG Lötter, SAAPMB congress, June 1997 (Capetown).

Dosis distribusies vir 8 MV X-strale in RT-gebaseerde pasiënt modelle: ‘n Vergelyking tussen Monte Carlo en konvensionele behandelings beplanning metodes,*FCP du Plessis, CA Willemse, MG Lötter, Faculty forum, August 1999 (Bloemfontein).

Monte Carlo Principles and Applications in Radiotherapy (Invited lecture),*FCP du Plessis, CA Willemse, SAAPMB congress, June 2000 (Durban).

Comparative dose distributions of 8MV X-rays between Monte Carlo and the generalized Batho and ETAR methods in CT based patient models.,*FCP du Plessis, CA Willemse, MG Lötter, SAAPMB congress, June 2000 (Durban).

Evaluation of Shielding Calculations at National Hospital,*W Shaw and FCP du Plessis, SAAPMB congress, July 2002 and faculty forum, August 2002 (Bloemfontein).

Effective attenuation coefficients for compensator materials,*FCP du Plessis, CA Willemse, SAAPMB congress, June 2003 (Itemba Labs, Faure).

Radiological properties of a new wax-gypsum compensator material, *FCP du Plessis, CA Willemse, SAIP congress, June 2004 (Bloemfontein).

Properties of wax-gypsum as a compensator material, *CA Willemse, FCP du Plessis, SAAPMB congress, September 2004 (Johannesburg).

A Monte Carlo Dataset for Treatment Unit Characterization on Helax-TMS, *W Shaw, FCP du Plessis, SAAPMB congress, September 2004 (Johannesburg).


A Practical Monte Carlo MU Verification Tool for IMRT Quality Assurance, *J Fan, J Li, L Chen, W Xiong, S Stathakis, W Luo, FCP du Plessis, C-M Ma, 47th Annual AAPM meeting held in Seattle during 24 – 28 July 2005.

Energy and Intensity Modulated Electron Radiation Therapy Using a Monte Carlo Optimization Procedure, *A Leal, C-M Ma, FCP du Plessis, J.I. Lagares, J Li, L Qin, W Xiong, S Stathakis, W Luo, Z Chen, 47th Annual AAPM meeting held in Seattle during 24 – 28 July 2005.

Analytical Modeling of Pencil Beams to Include Compensator-Related Beam Perturbations, *FCP du Plessis, C-M (Charlie) Ma, CA Willemse, 47th Annual AAPM meeting held in Seattle during 24 – 28 July 2005.

Advanced Tools for Mixed Beam Radiotherapy Using IMRT and Modulated Electrons, *C-M Ma, J Li, P Price, S McNeeley, W Xiong, A Leal, FCP du Plessis, Radiological Society of North America’s 91st Scientific Assembly held in Chicago Illinois, Nov 27 – Des 2, 2005.

Energy and intensity modulated electron radiation therapy by means of a Monte Carlo routine, *A leal, C-M Ma, FCP du Plessis, J Lagares, J Li, 8th Biennial ESTRO Meeting on Physics and Radiation Technology for Clinical Radiotherapy held in Lisboa (Portugal), September 24 – Sep 29, 2005.

CHARTERIZATION OF MEGAVOLTAGE ELECTRON BEAMS DELIVERED THROUGH A PHOTON MULTI LEAF COLLIMATOR (pMLC), *F C P du Plessis, A Leal, S Stathakis, W Xiong and C-M Ma., 45th SAAPMB congress, March 2006 (Cape town)

COMPARISON AND CORRECTION OF PENCIL BEAM DOSE CALCULATIONS THAT INCLUDE COMPENSATOR-RELATED BEAM PERTURBATIONS WITH DOSXYZ, *F.C.P. du Plessis, C.A. Willemse, 45th SAAPMB congress, March 2006 (Cape town)

EFFECTIVENESS OF DOSE DISTRIBUTION CALCULATIONS IN PARTIALLY BLOCKED FIELDS BENCHMARKED AGAINST MONTE CARLO, *W Shaw, F.C.P. du Plessis, 45th SAAPMB congress, March 2006 (Cape town)

Analytical modeling of narrow x-ray beams to include scatter effects from beam absorbers , *Dr F.C.P du Plessis, Prof. C.A. Willemse, Medical sciences faculty forum, 2006

Evaluation of pencil beam dose calculations under beam compensators., *Dr F.C.P du Plessis, Prof. C.A. Willemse, Medical sciences faculty forum, 2006

The influence of a photon collimation system on mixed-energy electron beam dose distributions, *F C P du Plessis1, A Leal2, S Stathakis2, W Xiong2, C-M Ma2 and CA Willemse1, 1 Department of Medical Physics, University of the Free State, 2 Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, USA, Medical sciences faculty forum, 2006

Development of a stereotactic radiosurgery system, *W. Shaw, Dr F.C.P du Plessis, Prof. C.A. Willemse, Medical sciences faculty forum, 2006

Effectiveness of dose distribution calculations in partially blocked fields benchmarked against Monte Carlo, *W. Shaw, Dr F.C.P du Plessis, Prof. C.A. Willemse, Medical sciences faculty forum, 2006

On the accuracies of calculated doses in patient CT models, *W. Shaw, Dr F.C.P du Plessis, Prof. C.A. Willemse, Medical sciences faculty forum, 2006

Characterization and stability electron beam output factors for an Elekta Precise linac,*J Steyn, F.C.P. du Plessis,46th SAAPMB congress, September 2007 (Johannesburg)

Characterization of beam output for megavoltage electron beams produced by an Elekta SL25 linac, *N Benecke, F.C.P. du Plessis,46th SAAPMB congress, September 2007 (Johannesburg)

Characterization and comparison of beam output over time for megavoltage electron beams produced by an Philips SL75/14N linac, *V Steyn, F.C.P. du Plessis, 46th SAAPMB congress, September 2007 (Johannesburg)

Motivation for Monte Carlo benchmarking against kernel based algorithms, *W Shaw, F.C.P. du Plessis, 46th SAAPMB congress, September 2007 (Johannesburg)

Determination of electron beam output factors for a 14-MeV linear accelerator (Philips SL75/14N), *V Jonas, F.C.P. du Plessis and C.A. Willemse

Medical sciences faculty forum, 2007, Characterization and stability of electron beam output factors for an Elekta precise linac, *J Steyn, F.C.P. du Plessis and C.A. Willemse, Medical sciences faculty forum, 2007

Dose prescription considerations for future radiotherapy treatment planning, *W Shaw, F.C.P. du Plessis and A. Sherriff, Medical sciences faculty forum, 2007

Development of compensator planning system, * F.C.P. du Plessis and C.A. Willemse, 48th SAAPMB congress, June 2008 (Durban)

Monte Carlo modeling of an Elekta linear accelerator, *Omer.A. ALI, F.C.P du Plessis and C.A. Willemse, 48th SAAPMB congress, June 2008 (Durban)

EVALUATION OF ELECTRON BEAM ENERGIES FOR LINEAR ACCELERATORS, *ID Venter and F.C.P. du Plessis, 48th SAAPMB congress, June 2008 (Durban)

A General Electron Source Model for Radiotherapy Treatment Planning, *W. Shaw and FCP du Plessis, 48th SAAPMB congress, June 2008 (Durban)

A computer program for planning standard HDR brachytherapy treatments for Ca Cervix, *C.A. Willemse, W shaw and F.C.P. du Plessis, 48th SAAPMB congress, June 2008 (Durban)

A Monte Carlo model of an In Vivo Radiation Dosemeter, *F.C.P. du Plessis, Medical sciences faculty forum, 2008

An electron beam model for radiation treatment planning, *W Shaw and F.C.P. du Plessis, Medical sciences faculty forum, 2008

Monte Carlo modeling of an Elekta linear accelerator, *Omer A, F.C.P. du Plessis and CA Willemse, Medical sciences faculty forum, 2008

Characterization of ELEKTA Precise pMLC system for MERT application, *Omer.A. ALI, and F.C.P du Plessis, 48th SAAPMB congress, March 2009 (Bloemfontein)

Derivation of electron energy spectra from depth dose curves using least-square minimization methods and Monte Carlo data, *Omer.A. ALI, and F.C.P du Plessis, 48th SAAPMB congress, March 2009 (Bloemfontein)

TOPOGRAPHY BASED ENERGY OPTIMIZATION FOR PMLC COLLIMATED MEGAVOLTAGE ELECTRONS: A MONTE CARLO STUDY, *F.C.P. du Plessis and C.A. Willemse, 48th SAAPMB congress, March 2009 (Bloemfontein)

MONTE CARLO STUDIES OF QED IN VIVO RADIATION DOSIMETERS, F.C.P. du Plessis, 48th SAAPMB congress, March 2009 (Bloemfontein)

A SIMPLE SOURCE MODEL FOR MONTE CARLO SIMULATION OF MEGAVOLT PHOTON BEAMS, *C.A. Willemse and F.C.P. du Plessis, 48th SAAPMB congress, March 2009 (Bloemfontein)

EVALUATION OF AN EXISTING PORTAL IMAGING DEVICE FOR FAN BEAM RECONSTRUCTION, *FHJ O’Reilly, CA Willemse, WID Rae, CP Herbst and FCP du Plessis, 48th SAAPMB congress, March 2009 (Bloemfontein)

Publications (Short List)

The indirect use of CT numbers to establish material properties needed for Monte Carlo calculation of dose distributions in patients, F.C.P. du Plessis*, C.A. Willemse, M.G. Lötter & L. Goedhals, Medical Physics 27(7), July 1998, 1195 -1201

Comparison of the Batho, ETAR and Monte Carlo dose calculation methods in CT based patient models, F.C.P. du Plessis*, C.A. Willemse, M.G. Lötter & L. Goedhals, Medical Physics 28(4), April 2001, 582-589

Monte Carlo calculation of effective attenuation coefficients for various compensator materials, F.C.P. du Plessis* and C.A. Willemse, Medical Physics 30(9), September 2003, 2537 - 2544,

Radiological properties of a wax-gypsum compensator material, F.C.P. du Plessis* and C.A. Willemse, Medical Physics 32(5), May 2005, 1246 - 1255

Characterization of megavoltage electron beams delivered through a photon multi leaf collimator (pMLC), F C P du Plessis*, A Leal, S Stathakis, W Xiong and C-M Ma, Phys. Med. Biol. 51 (8), 2006, 2113-2129.

A practical Monte Carlo MU verification tool for IMRT quality assurance, J Fan, J Li, L Chen, S Stathakis, W Luo, F Du Plessis*, W Xiong, J Yang and C-M Ma Phys. Med. Biol. 51 (10), (2006), 2503-2516.

Inclusion of compensator-induced scatter and beam filtration in pencil beam dose calculations, F.C.P. du Plessis* and C.A. Willemse, Medical Physics 33(8), August 2006, 2896 - 2904

Area(s) of Interest

Monte Carlo simulation, Radiation protection, Modulated electron radiation treatment, Absorbed dose calculations

Courses Presented

Radiation dose calculation, Accelerator theory, optics for Opthalmology.

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