Methods for interventional magnetic resonance imaging

This thesis has as its central aim to demonstrate, develop, discuss and promote new methods and technology for improving interventional low field magnetic resonance imaging. The work addresses problems related to accurate localization of minimally invasive surgical tools by describing novel devices and improvements to prior art techniques, such as optical tracking. In addition to instrument guidance, ablative treatment of liver tumours is discussed in connection with low field temperature measurement and the work describes suitable sequences for qualitative temperature imaging. For instrument localization, a method utilising ex vivo Overhauser enhancement of a catheter like structure was demonstrated. An enhancement factor of 10 was achieved, proving that a substantial signal gain is possible through the use of ex vivo-enhanced liquid. Similarly, a method for biopsy needle tip tracking was developed; where the position of the tip was tracked with a signal from a miniaturized electron spin resonance sample and gradient pulses. At an update rate of 10 samples per second, the accuracy was measured to be better than ±2 mm within a homogeneous sphere of 300 mm. Optical tracking methods concentrated on new indications of use for the developed optical tracking system and associated software: The system was applied to guide the needle 35 times into first sacral root foramina, with a success rate of 97%. It was also used in five bone biopsies, all of which were performed successfully, the samples allowed for a pathologic diagnosis, and the percutaneous procedures could be performed in less than 40 minutes. A new patient tracker device was developed for staged neurosurgical procedures and demonstrated with two patient cases. In the temperature measurement study, spin echo, gradient echo and completely balanced steady-state free precession sequences were optimized for maximal temperature sensitivity and the optimized sequences compared. The steady-state sequence seemed the most promising for the prediction of ablated volume in liver.reviewe

Koulun päärakennuksen peruskorjauksen hankesuunnitelma

Opinnäytetyö käsittelee Ilmajoella sijaitsevan maatalousoppilaitoksen päärakennuksen peruskorjauksen hankesuunnitelmaa. Rakennus on 1980-luvulla rakennettu ja siihen on tehty 2000-luvun alussa laajennus. Rakennukselle suunnitellaan tilojen muutoksia sekä korjauksia seuraavalle viidelletoista vuodelle. Opinnäytetyössä käydään läpi koulun historiaa, rakennuksen rakenteita sekä mahdollisia korjaustoimenpiteitä. Työhön sisältyy myös hankkeen kustannusarviointi sekä arvioitu aikataulu. Hankesuunnitelman tarkoituksena on koota yhteen lähtötiedot ja verrata eri toteutusmuotoja sekä toimia toteutussuunnitelmien pohjana. Hankesuunnitelmaan pohjautuen tehdään investointi päätös. Maatalousoppilaitoksen päärakennukseen tullaan tulevaisuudessa sijoittamaan lisää toimintaa ja käyttäjiä, joten tilojen tehokkaammalle käytölle on tarvetta. Rakennuksen rakenteiden korjaus on tärkeää hyvinvoinnin ja viihtyvyyden kannalta.This thesis deals with the project plan for the renovation of the main building of an agricultural school in Ilmajoki. The building was built in the 1980´s and has been expanded in the early 2000´s. Changes to the premises and renovations are planned to take place in the next 15 years. My thesis examines the history of the school, the structures of the building and the possible repairs. The work also includes the cost assessment of the project and an estimated timetable. The purpose of the project plan is to bring together and compare different types of implementations and work as a basis for implementation plans. An investment decision will be based on project plan. More activities and users will be placed in the building in the future, so, there is a need for more efficient use of the premises. Repairing the structures of the building is important for well-being and comfort