Sökning: "Substitute CT"

Visar resultat 6 - 10 av 12 avhandlingar innehållade orden Substitute CT.

  1. 6. Geometric distortions in MRI based radiotherapy and PET/MRI

    Författare :Josef Lundman; Tufve Nyholm; Anne Larsson; Jörgen Olofsson; Marco Riboldi; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Magnetic resonance imaging; MRI; PET MR; PET MRI; medical imaging; radiotherapy; geometrical distortions; MR-only; MRI-only; radiofysik; radiation physics;

    Sammanfattning : Magnetic resonance imaging (MRI) offers high soft-tissue contrast compared to computed tomography (CT). This contrast is helpful in many cases, not least for delineating tumours for radiotherapy treatment, and has led to increasing use in radiotherapy treatment planning (RTP). LÄS MER

  3. 7. Mechanical analyses of trabecular bone and its interaction with implants

    Författare :Dan Wu; Cecilia Persson; Hanna Isaksson; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Trabecular bone; Elastic modulus; Digital volume correlation; Pullout resistance; Micro-computed tomography.;

    Sammanfattning : Bone substitute materials or implants are commonly used in the surgical treatment of bone fractures. However, severe complications are sometimes reported. LÄS MER

  4. 8. Activity quantification based on scintillation camera imaging - Application to 111In/90Y radioimmunotherapy

    Författare :David Minarik; Lund Medicinsk strålningsfysik; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Radioimmunotherapy; bremsstrahlung imaging; activity quantification; SPECT; conjugate view; Yttrium;

    Sammanfattning : Radionuclide therapy (RNT), is important for the treatment of certain benign and malignant diseases. 90Y-Zevalin™ therapy has become an established method of treating patients with non-Hodgkin B-cell lymphoma. LÄS MER

  5. 9. Electrochemical detection of trace metals: from traditional techniques to new ultrathin membrane electrodes

    Författare :Kequan Xu; Gaston A. Crespo; Maria Cuartero; Tom Lindfors; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ion-selective electrodes; ion-stripping voltammetry; ultrathin membranes; interconnected ion-transfer and charge-transfer processes; trace metals; environmental waters; jonselektiva elektroder; jon-strippande voltammetri; ultratunna membran; sammankopplade jonöverförings- och laddningsöverförings-processer; spårmetaller; miljövatten; Kemi; Chemistry;

    Sammanfattning : Accurate detection of trace metals in environmental waters is an analytical challenge that is still open for the time being. The current state of the field reveals the predominance of the so-called hanging mercury drop electrode (HMDE) for multi-metal detection by means of anodic stripping voltammetry (ASV) readout. LÄS MER

  7. 10. Are gadolinium contrast media really less nephrotoxic than iodine agents in radiographic examinations? A comparison in relation to their ability to attenuate x-rays in a pig model

    Författare :Barbara Elmståhl; Malmö Diagnostisk radiologi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Angiography; Computed tomography; toxicity; Contrast media; Glomerular filtration; Gadolinium; Iodine; Kidney failure; Nephrotoxicity.; Medicin människa och djur ; radiology; Clinical physics; Medicine human and vertebrates ; tomography; medical instrumentation; Diagnostik; Diagnostics; medicinsk instrumentering; tomografi; radiologi; Klinisk fysiologi;

    Sammanfattning : Purpose: To confront the statement that gadolinium contrast media (Gd-CM) are less nephrotoxic than iodine contrast media (I-CM) when used in x-ray angiographic and computed tomographic (CT) examinations. Methods: I) For CT measurements (mean density in Hounsfield numbers) 20-mL syringes filled with I- and Gd-CM at 0.01, 0.02, 0. LÄS MER