Abstract:
:Gating is a relatively new and potentially useful therapeutic addition to external beam radiotherapy applied to regions affected by intra-fraction motion. The impact was of gating on treatment margins, image artifacts, and volume and positional accuracy was investigated by CT imaging of sinusoidally moving spheres. The motion of the spheres simulates target motion. During the CT imaging of dynamically moving spheres, gating reproduced the static volume to within 1%, whereas errors of over 20% were observed where gating was not used. Using a theoretical analysis of margins, gating alone or in combination with an electronic portal imaging device may allow a 2-11 mm reduction in the CTV to PTV margin, and thus less healthy tissue need be irradiated. Gating may allow a reduction of treatment margins, an improvement in image quality, and an improvement in positional and volumetric accuracy of the gross tumor volume.
journal_name
Australas Phys Eng Sci Medjournal_title
Australasian physical & engineering sciences in medicineauthors
Keall PJ,Kini VR,Vedam SS,Mohan Rdoi
10.1007/BF03178368subject
Has Abstractpub_date
2002-03-01 00:00:00pages
1-6issue
1eissn
0158-9938issn
1879-5447journal_volume
25pub_type
杂志文章abstract::This note investigates in-vivo dosimetry using a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) for radiotherapy treatment at superficial and orthovoltage x-ray energies. This was performed within one fraction of the patients treatment. Standard measurements along with energy response of the detector are g...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:2003-06-01 00:00:00
abstract::Ischaemic stroke is a major public health issue in both developed and developing nations. Hypothermia is believed to be neuroprotective in cerebral ischaemia. Conversely, elevated brain temperature is associated with poor outcome after ischaemic stroke. Mechanisms of heat exchange in normally-perfused brain are relati...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
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更新日期:2017-12-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178625
更新日期:2009-03-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-019-00817-7
更新日期:2019-12-01 00:00:00
abstract::In-phantom figures of merit of the radiobiological dose distribution are the main criteria for evaluation of the boron neutron capture therapy (BNCT) plan and neutron beam evaluation. Since in BNCT there are several reactions, which contribute to the total dose of the tissue, the calculation of the dose distribution i...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-011-0107-z
更新日期:2011-12-01 00:00:00
abstract::The computed tomography (CT) imaging artefacts that metallic medical implants produce in surrounding tissues are usually contoured and over-ridden during radiotherapy treatment planning. In cases where radiotherapy treatment beams unavoidably pass though implants, it is especially important to understand the imaging a...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-013-0197-x
更新日期:2013-06-01 00:00:00
abstract::The effect of radiation in regard to breast carcinogenesis is well studied and analysed from data from atomic bomb survivors, patients treated for acute mastitis and tuberculosis patients monitored by fluoroscopy. Therefore the radiation received by the untreated breast during breast irradiation of the other breast, i...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178353
更新日期:2001-06-01 00:00:00
abstract::The fragility of trabecular bone depends not only on the amount of bone but also on its architecture. In order to assess fragility of bone, describe changes due to age, and monitor effect of disease or treatment, it is necessary to model the physical properties of trabecular bone architecture. An important feature of ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:2006-03-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-019-00745-6
更新日期:2019-06-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178774
更新日期:2002-09-01 00:00:00
abstract::The Australasian College of Physical Scientists and Engineers in Medicine (ACPSEM) Radiation Oncology Specialty Group (ROSG) formed a series of working groups in 2011 to develop position papers for guidance of radiation oncology medical physics practice within the Australasian setting. These position papers are intend...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-013-0238-5
更新日期:2014-03-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-017-0573-z
更新日期:2017-09-01 00:00:00
abstract::A set of four 4 MV photon beam compensators were produced, one for each field of a Hodgkins Disease treatment plan. The resultant dose profiles at various depths were measured by an ion chamber in water and by Kodak X-Omat V film in a Solid Water phantom, and compared to the doses calculated by a GE RT/Plan treatment ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1992-03-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章,评审
doi:10.1007/s13246-016-0438-x
更新日期:2016-06-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:2000-09-01 00:00:00
abstract::Post installation acceptance testing is vital to demonstrate that the equipment meets the vendor's specification and is suitable for clinical studies. The test procedures described in the NEMA NU 2-2001 document form the basis of vendor performance specifications of PET scanners and hence are also appropriate for acce...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-010-0016-6
更新日期:2010-06-01 00:00:00
abstract::Helical tomotherapy (HT) is a novel radiotherapy treatment modality that allows the delivery of intensity modulated radiation in a rotational fashion. Due to the complexity of the treatment approach, it is desirable to have a simple tool for treatment delivery verification. Radiographic film placed under the patient i...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178723
更新日期:2005-12-01 00:00:00
abstract::Interest in human emotion recognition, regarding physiological signals, has recently risen. In this study, an efficient emotion recognition system, based on geometrical analysis of autonomic nervous system signals, is presented. The electrocardiogram recordings of 47 college students were obtained during rest conditio...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-017-0530-x
更新日期:2017-06-01 00:00:00
abstract::This paper describes a software tool developed for research into the use of an electronic portal imaging device (EPID) to verify dose for intensity modulated radiation therapy (IMRT) beams. A portal dose image prediction (PDIP) model that predicts the EPID response to IMRT beams has been implemented into a commerciall...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03179347
更新日期:2008-09-01 00:00:00
abstract::The risk of inducing contralateral breast (CLB) cancer in patients undergoing tangential field irradiation for the treatment of breast cancer is a serious concern in radiation oncology. A bilateral breast phantom made of wax attached onto the Alderson Rando phantom was used for studying the CLB dose for techniques usi...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/BF03178408
更新日期:2007-03-01 00:00:00
abstract::Wavelet theory is emerging as one of the prevalent tool in signal and image processing applications. However, the most suitable mother wavelet for these applications is still a relative question mark amongst researchers. Selection of best mother wavelet through parameterization leads to better findings for the analysi...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-014-0264-y
更新日期:2014-06-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1998-06-01 00:00:00
abstract::Two software packages designed for automatic counting nuclear tracks are tested and compared. The image processing in the first package is divided into three parts segmentation, speckle elimination and removal of ill-formed track holes. The second package is also divided into three parts but the last part is modified ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1992-06-01 00:00:00
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journal_title:Australasian physical & engineering sciences in medicine
pub_type: 临床试验,杂志文章
doi:10.1007/s13246-016-0471-9
更新日期:2016-12-01 00:00:00
abstract::The use of Speiser needles for interstitial implants has resulted in malfunctioning of HDR afterloading equipment due to seepage of blood. We have successfully used rounded ended needles in the patient after removal of the trocar ended needles, preventing the seepage of blood. This technique also helps to prevent any ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1999-12-01 00:00:00
abstract::Rotary blood pumps have the potential to become a viable long-term treatment option for the heart failure patients to bridge to transplantation or destination therapy. However, these devices operate at a constant speed which may lead to long term complications or they may operate in an undesired support mode such as e...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章,评审
doi:10.1007/s13246-015-0405-y
更新日期:2016-03-01 00:00:00
abstract::A study was made of calibrating the NACP plane parallel chamber in electron beams from linear accelerators of a different manufacture with energies, Ep,o' from 4.4 to 19.1 MeV, and also in 4 and 6 MV photon beams as well as a cobalt60 beam. The photon beam measurements were both IN-AIR and IN-PHANTOM. With the excepti...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1996-09-01 00:00:00
abstract::The angular distribution for electron beams produced by the Siemens KD-2 linear accelerator has been found by simulating electron transport through the scattering foils and air using two methods: Fermi-Eyges multiple Coulomb scattering calculations, and EGS4 Monte Carlo simulations. Fermi-Eyges theory gives solutions ...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:
更新日期:1994-09-01 00:00:00
abstract::Diamond detectors are particularly well suited for dosimetry applications in radiotherapy for reasons including near-tissue equivalence and high-spatial resolution resulting from small sensitive volumes. However, these detectors have not become commonplace due to high cost and poor availability arising from the need f...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章
doi:10.1007/s13246-010-0040-6
更新日期:2010-12-01 00:00:00
abstract::This article outlines the enormous technological advances that have taken place in the practice of radiology in Australasia in the 30 years since approximately 1977. These developments have led to significant improvements in image quality across all modalities, including even general radiography, which had as its gene...
journal_title:Australasian physical & engineering sciences in medicine
pub_type: 杂志文章,评审
doi:10.1007/BF03178423
更新日期:2007-09-01 00:00:00