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- Bai, Xuemei, et al.
(författare)
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Defining and advancing a systems approach for sustainable cities
- 2016
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Ingår i: Current Opinion in Environmental Sustainability. - : Elsevier BV. - 1877-3435 .- 1877-3443. ; 23, s. 69-78
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Forskningsöversikt (refereegranskat)abstract
- The sustainable development of cities is increasingly recognized as crucial to meeting collectively agreed sustainability goals at local, regional and global scales, and more broadly to securing human well-being worldwide. The UN Sustainable Development Goals (SDGs) include a goal on cities (Goal 11), with most other goals and targets have urban applications and multi scalar implications for their implementation. Further, the interdependencies - including synergies and trade-offs among the various SDGs are greater in cities, presenting both challenges and opportunities. A systems approach is urgently needed in urban research and policy analysis, but such an approach rarely features in current analysis or urban decision-making for various reasons. This paper explores four questions: why a systems approach is necessary, what defines such an approach, why has this rarely been adopted in practice, and what can be done to promote its use. We argue that a systems approach can reveal unrecognized opportunities to maximize co-benefits and synergies, guide management of inevitable trade-offs, and therefore inform prioritisation and successful solutions. We present four key issues for the effective implementation of the SDGs and the New Urban Agenda, which emerged from UN Habitat III Conference, namely: (a) a radical redesign of the multilateral institutional setup on urban issues; (b) promoting regenerative culture, behaviour, and design; (c) exploring ways to finance a systems approach; and (d) a new and enhanced role for science in sustainable development. The latter issue could be addressed through Future Earth's Urban Knowledge-Action Network, which aims at co-designing and co-producing cutting-edge and actionable knowledge for sustainable cities bringing together researchers and urban decision-makers and practitioners.
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| 2. |
- Wesolowska, Paulina, et al.
(författare)
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Testing the methodology for a dosimetric end-to-end audit of IMRT/VMAT: results of IAEA multicentre and national studies
- 2019
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Ingår i: Acta Oncologica. - : TAYLOR & FRANCIS LTD. - 0284-186X .- 1651-226X. ; 58:12, s. 1731-1739
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: Within an International Atomic Energy Agency (IAEA) co-ordinated research project (CRP), a remote end-to-end dosimetric quality audit for intensity modulated radiation therapy (IMRT)/ volumetric arc therapy (VMAT) was developed to verify the radiotherapy chain including imaging, treatment planning and dose delivery. The methodology as well as the results obtained in a multicentre pilot study and national trial runs conducted in close cooperation with dosimetry audit networks (DANs) of IAEA Member States are presented. Material and methods: A solid polystyrene phantom containing a dosimetry insert with an irregular solid water planning target volume (PTV) and organ at risk (OAR) was designed for this audit. The insert can be preloaded with radiochromic film and four thermoluminescent dosimeters (TLDs). For the audit, radiotherapy centres were asked to scan the phantom, contour the structures, create an IMRT/VMAT treatment plan and irradiate the phantom. The dose prescription was to deliver 4 Gy to the PTV in two fractions and to limit the OAR dose to a maximum of 2.8 Gy. The TLD measured doses and film measured dose distributions were compared with the TPS calculations. Results: Sixteen hospitals from 13 countries and 64 hospitals from 6 countries participated in the multicenter pilot study and in the national runs, respectively. The TLD results for the PTV were all within +/- 5% acceptance limit for the multicentre pilot study, whereas for national runs, 17 participants failed to meet this criterion. All measured doses in the OAR were below the treatment planning constraint. The film analysis identified seven plans in national runs below the 90% passing rate gamma criteria. Conclusion: The results proved that the methodology of the IMRT/VMAT dosimetric end-to-end audit was feasible for its intended purpose, i.e., the phantom design and materials were suitable; the phantom was easy to use and it was robust enough for shipment. Most importantly the audit methodology was capable of identifying suboptimal IMRT/VMAT delivery.
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