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Journal Details
Format
Journal
eISSN
1898-0309
First Published
30 Dec 2008
Publication timeframe
4 times per year
Languages
English

Search

Volume 13 (2007): Issue 2 (June 2007)

Journal Details
Format
Journal
eISSN
1898-0309
First Published
30 Dec 2008
Publication timeframe
4 times per year
Languages
English

Search

5 Articles
Open Access

Measurement of Transit Time of a Gammamed-Plus Remote Afterloading High Dose Rate Brachytherapy Source

Published Online: 30 Dec 2008
Page range: 55 - 63

Abstract

Measurement of Transit Time of a Gammamed-Plus Remote Afterloading High Dose Rate Brachytherapy Source

Accurate measurement of transit time of the HDR brachytherapy source of a remote after-loading unit is necessary to calculate the total radiation dose given to the treatment volume. Presently, most of the HDR brachytherapy treatment planning systems neglect the transit time in the computation of dose. The aim of this investigation is to use a well type ionization chamber to measure the transit time during the source movement between two dwell positions. As well type ionization chamber and a precision electrometer (manufacturer CD instruments, Bangalore) were used to measure the charge generated during the movement of the Ir-192 source of a Gammamed HDR brachytherapy unit with an interstitial needle. Effective transit time and effective speed were determined on the basis of methodology described by Sahoo [2]. Corrections were done on the basis of relative sensitivity values for varaious dwell position in the ionization chamber. In the present study the variation of effective speed with interdwell distance was minimal as compared with that of Sahoo [2]. The effective transit times were 0.129, 0.182, 0.301, 0.402, 0.701, and 0.993 seconds for 1, 2, 4, 6, 8 and 10 cm interdwell separations respectively. The effective transit times in the present study were higher than those of Sahoo [2]. Software modification accounting for the dynamic dose should be incorporated into all HDR planning systems. Such an improvement would enhance the safety and accuracy of HDR brachytherapy.

Keywords

  • HDR brachytherapy
  • transit time
  • dynamic dose
  • HDR planning system
  • accuracy of HDR brachytherapy
Open Access

A Multiscale Entropy Analysis of Physiological and Malignant Breast Tissues Imaged by an Optical Polarimeter

Published Online: 30 Dec 2008
Page range: 65 - 78

Abstract

A Multiscale Entropy Analysis of Physiological and Malignant Breast Tissues Imaged by an Optical Polarimeter

There are indications in the literature that polarimetric observations of neoplastic changes in biological tissues may support early diagnosis of cancer. In the present studies, samples of human breast tissue were observed in a polarized light. The images of healthy and malignant tissues were decomposed by a à trous wavelet algorithm. When a multiscale representation of tissue images is determined, their autocorrelation functions are also compared. A comparison of new observables, multiscale entropy and mean entropy vectors are presented. It was found that these observables might be considered as possible indicators of the malignant transformation in tissue.

Keywords

  • birefringence in biotissues
  • polarimetry
  • multiscale image analysis
  • image entropy
Open Access

Ionisation Chambers Containing Boron as Neutron Detectors in Mixed Radiation Fields

Published Online: 30 Dec 2008
Page range: 79 - 91

Abstract

Ionisation Chambers Containing Boron as Neutron Detectors in Mixed Radiation Fields

The paper presents a newly designed ionisation chambers containing boron, operated in the initial recombination regime. The chambers were either filled with BF3 or the chamber electrodes were covered with B4C. The chambers can be placed in paraffin moderators. The sensitivity of the chambers was investigated depending on gas pressure, moderator thickness and polarizing voltage. The results showed that it was possible to obtain nearly the same sensitivity of the chamber to H* (10) for photons and neutrons in restricted energy range, however further investigations are needed to make an optimum design. The examples of applications for dosimetric measurements in mixed radiation fields near medical linear accelerator and in the vicinity of high-energy proton accelerator are presented.

Keywords

  • recombination chambers
  • neutron dosimetry
  • boron
Open Access

Implementation of Impedance Method in Syncope Treatment

Published Online: 30 Dec 2008
Page range: 93 - 103

Abstract

Implementation of Impedance Method in Syncope Treatment

Current syncope treatment by cardiac pacing is limited to patients developing cardiodepressive reaction. There is strong need to apply this method to other types of reaction. Presented method shows, that impedance method can be applied for early detection of vasodepressive syncope. Thus the method can be applied for antivasovagal pacing in syncopic patients.

Keywords

  • impedance cardiography
  • cardiac pacing
  • syncope
Open Access

First Results of the Implementation of Telemedical Service in The Odessa Region

Published Online: 30 Dec 2008
Page range: 105 - 114

Abstract

First Results of the Implementation of Telemedical Service in The Odessa Region

Results on the implementation of technical system purposed for telemedical consultations in Odessa Region of Ukraine are presented. Such a system permitted to perform telemedical consultations in the form of videoconferences with parallel transmission of medical images, and ECG records. First (half year) experience of performing consultative activity was in favour of identification of urgent indications for surgery in some patients, and proved to be preventive with regard to some complications in patients with acute heart and vessel diseases as well as in patients with traumas. The main conclusion on high effectiveness of proposed telemedical technical configuration, and especially in terms of heightening standards of regional medical care was made.

Keywords

  • telemedical consultations
  • technical telemedical system
  • health care system
5 Articles
Open Access

Measurement of Transit Time of a Gammamed-Plus Remote Afterloading High Dose Rate Brachytherapy Source

Published Online: 30 Dec 2008
Page range: 55 - 63

Abstract

Measurement of Transit Time of a Gammamed-Plus Remote Afterloading High Dose Rate Brachytherapy Source

Accurate measurement of transit time of the HDR brachytherapy source of a remote after-loading unit is necessary to calculate the total radiation dose given to the treatment volume. Presently, most of the HDR brachytherapy treatment planning systems neglect the transit time in the computation of dose. The aim of this investigation is to use a well type ionization chamber to measure the transit time during the source movement between two dwell positions. As well type ionization chamber and a precision electrometer (manufacturer CD instruments, Bangalore) were used to measure the charge generated during the movement of the Ir-192 source of a Gammamed HDR brachytherapy unit with an interstitial needle. Effective transit time and effective speed were determined on the basis of methodology described by Sahoo [2]. Corrections were done on the basis of relative sensitivity values for varaious dwell position in the ionization chamber. In the present study the variation of effective speed with interdwell distance was minimal as compared with that of Sahoo [2]. The effective transit times were 0.129, 0.182, 0.301, 0.402, 0.701, and 0.993 seconds for 1, 2, 4, 6, 8 and 10 cm interdwell separations respectively. The effective transit times in the present study were higher than those of Sahoo [2]. Software modification accounting for the dynamic dose should be incorporated into all HDR planning systems. Such an improvement would enhance the safety and accuracy of HDR brachytherapy.

Keywords

  • HDR brachytherapy
  • transit time
  • dynamic dose
  • HDR planning system
  • accuracy of HDR brachytherapy
Open Access

A Multiscale Entropy Analysis of Physiological and Malignant Breast Tissues Imaged by an Optical Polarimeter

Published Online: 30 Dec 2008
Page range: 65 - 78

Abstract

A Multiscale Entropy Analysis of Physiological and Malignant Breast Tissues Imaged by an Optical Polarimeter

There are indications in the literature that polarimetric observations of neoplastic changes in biological tissues may support early diagnosis of cancer. In the present studies, samples of human breast tissue were observed in a polarized light. The images of healthy and malignant tissues were decomposed by a à trous wavelet algorithm. When a multiscale representation of tissue images is determined, their autocorrelation functions are also compared. A comparison of new observables, multiscale entropy and mean entropy vectors are presented. It was found that these observables might be considered as possible indicators of the malignant transformation in tissue.

Keywords

  • birefringence in biotissues
  • polarimetry
  • multiscale image analysis
  • image entropy
Open Access

Ionisation Chambers Containing Boron as Neutron Detectors in Mixed Radiation Fields

Published Online: 30 Dec 2008
Page range: 79 - 91

Abstract

Ionisation Chambers Containing Boron as Neutron Detectors in Mixed Radiation Fields

The paper presents a newly designed ionisation chambers containing boron, operated in the initial recombination regime. The chambers were either filled with BF3 or the chamber electrodes were covered with B4C. The chambers can be placed in paraffin moderators. The sensitivity of the chambers was investigated depending on gas pressure, moderator thickness and polarizing voltage. The results showed that it was possible to obtain nearly the same sensitivity of the chamber to H* (10) for photons and neutrons in restricted energy range, however further investigations are needed to make an optimum design. The examples of applications for dosimetric measurements in mixed radiation fields near medical linear accelerator and in the vicinity of high-energy proton accelerator are presented.

Keywords

  • recombination chambers
  • neutron dosimetry
  • boron
Open Access

Implementation of Impedance Method in Syncope Treatment

Published Online: 30 Dec 2008
Page range: 93 - 103

Abstract

Implementation of Impedance Method in Syncope Treatment

Current syncope treatment by cardiac pacing is limited to patients developing cardiodepressive reaction. There is strong need to apply this method to other types of reaction. Presented method shows, that impedance method can be applied for early detection of vasodepressive syncope. Thus the method can be applied for antivasovagal pacing in syncopic patients.

Keywords

  • impedance cardiography
  • cardiac pacing
  • syncope
Open Access

First Results of the Implementation of Telemedical Service in The Odessa Region

Published Online: 30 Dec 2008
Page range: 105 - 114

Abstract

First Results of the Implementation of Telemedical Service in The Odessa Region

Results on the implementation of technical system purposed for telemedical consultations in Odessa Region of Ukraine are presented. Such a system permitted to perform telemedical consultations in the form of videoconferences with parallel transmission of medical images, and ECG records. First (half year) experience of performing consultative activity was in favour of identification of urgent indications for surgery in some patients, and proved to be preventive with regard to some complications in patients with acute heart and vessel diseases as well as in patients with traumas. The main conclusion on high effectiveness of proposed telemedical technical configuration, and especially in terms of heightening standards of regional medical care was made.

Keywords

  • telemedical consultations
  • technical telemedical system
  • health care system

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