Sökning: "Leksell Gamma Knife®"

Visar resultat 1 - 5 av 12 uppsatser innehållade orden Leksell Gamma Knife®.

1. 1. Optimization of the Gamma Knife Treatment Room Design

   Master-uppsats, KTH/Fysik

   Författare :Nelly Nygren; [2021]
   Nyckelord :Gamma Knife; Treatment Room; Radiation Shielding; Dose Calculation; Computation; Monte Carlo; Simulation; Phase Space; Optimization; Gamma Knife; Behandlingsrum; Strålskydd; Stråldosberäkning; Beräkning; Monte Carlo; Simulering; Fasrum; Optimering;

   Sammanfattning : Radiation shielding is a central part of the design of treatment rooms for radiation therapy systems. The dose levels that medical staff and members of the public can be exposed to outside the treatment rooms are regulated by authorities and influence the required wall thicknesses and possible locations for the systems. LÄS MER

3. 2. Automatic Generation of Patient-specific Gamma Knife Treatment Plans for Vestibular Schwannoma Patients

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Simon Löw; [2020]
   Nyckelord :;

   Sammanfattning : In this thesis a new fully automatic process for radiotherapy treatment planning with the Leksell Gamma Knife is implemented and evaluated: First, a machine learning algorithm is trained to predict the desired dose distribution, then a convex optimization problem is solved to find the optimal Gamma Knife configuration using the prediction as the optimization objective. The method is evaluated using Bayesian linear regression, Gaussian processes and convolutional neural networks for the prediction. LÄS MER

4. 3. Designing a fast and robust device for measuring and providing graphical visualization of the number of 60Co sources in a Leksell Gamma Knife®

   Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

   Författare :Simon Andersson; [2020]
   Nyckelord :Cobalt 60; LGK; Leksell Gamma Knife; Counting sources; Elekta Instrument AB;

   Sammanfattning : The Leksell Gamma Knife® (LGK) is a device for performing radiosurgery. The LGK contains approximately 200 radioactive sources whose beams intersect in a focal point in order to treat brain tumours. Quality assurance tools are used at Elekta to indirectly assess the number of sources in an LGK from the total amount of radiation. LÄS MER

5. 4. Automatic Generation of Patient-specific Gamma Knife Treatment Plans for Vestibular Schwannoma Patients

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Simon Löw; [2020]
   Nyckelord :;

   Sammanfattning : In this thesis a new fully automatic process for radiotherapy treatment planning with the Leksell Gamma Knife is implemented and evaluated: First, a machine learning algorithm is trained to predict the desired dose distribution, then a convex optimization problem is solved to find the optimal Gamma Knife configuration using the prediction as the optimization objective. The method is evaluated using Bayesian linear regression, Gaussian processes and convolutional neural networks for the prediction. LÄS MER

7. 5. Gamma Knife treatment planning with new degrees of freedom

   Master-uppsats, KTH/Optimeringslära och systemteori

   Författare :Emil Norell; [2019]
   Nyckelord :Stereotactic radiosurgery; Leksell Gamma Knife®; inverse planning; clustering; optimization; column generation; Stereotaktisk radiokirurgi; strålkniven; inversplanering; klustring; optimering; kolumn-generering;

   Sammanfattning : The Leksell Gamma Knife® is an instrument designed for high precision treatment of tumours and lesions located in the brain and upper spine. Today, the radioactive cobalt-60 sources can only move linearly along the radiation unit, but the machine could be modified to include rotational motion as well. LÄS MER