2 research outputs found
A feasibility study of a rotary planar electrode array for electrical impedance mammography using a digital breast phantom
A feasibility study of an electrical impedance mammography (EIM) system
with a rotary planar electrode array, named RPEIM, is presented. The RPEIM
system is an evolution of the Sussex MK4 system, which is a prototype
instrument for breast cancer detection. Comparing it with the other planar
electrode EIM systems, the rotation feature enables a dramatic increase in
the number of independent measurements. To assist impedance evaluation
exploiting electrode array rotation, a synchronous mesh method is proposed.
Using the synchronous mesh method, the RPEIM system is shown to
have superior performance in image accuracy, spatial resolution and noise
tolerance over the MK4 system. To validate the study, we report simulations
based on a close-to-realistic 3D digital breast phantom, which comprises of:
skin, nipple, ducts, acinus, fat and tumor. A digital breast phantom of a real
patient is constructed, whose tumor was detected using the MK4 system. The
reconstructed conductivity image of the breast phantom indicates that the
breast phantom is a close replica of the patientâs real breast as assessed by the
MK4 system in a clinical trial. A comparison between the RPEIM system and
the MK4 system is made based on this phantom to assess the advantages of
the RPEIM system
Quantification en imagerie optique diffuse cérébrale : analyse du signal et étude du problÚme direct
Physiologie -- Physiologie cĂ©rĂ©brale humaine -- Couplage neurovasculaire -- Les vaisseaux sanguins cĂ©rĂ©braux : les principaux sinus -- Imagerie optique diffuse et analyse du signal -- DĂ©finition du problĂšme -- ProblĂšme direct -- ProblĂšme inverse -- MĂ©thode d'analyse en imagerie optique diffuse -- Neuronavigation IRM-IOD -- IRM fonctionnelle -- Physique de l'IRM -- Neuronavigation -- Ăquipement de neuronavigation et de visualisation -- Analyse de la sensibilitĂ© -- Inverted responses in diffuse optical imaging and their correlation with negative BOLD signal -- Materials and methods -- Results -- Quantification -- ProblĂšme direct en imagerie optique diffuse -- Segmentation des tissus Ă partir de donnĂ©es IRMa -- Simulation Monte Carlo -- Formulation du problĂšme -- DiscrĂ©tisation et mise en oeuvre numĂ©rique -- Hybrid boundary element method applied to volumetric diffuse optical tomography -- Definition of the problem -- Born approximation -- Numerical discretization -- Results