A5062038559- Advanced Radiotherapy Techniques
- Medical Imaging Techniques and Applications
- Radiation Dose and Imaging
- Radiation Therapy and Dosimetry
- Advanced X-ray and CT Imaging
- Nuclear Materials and Properties
- Biomarkers in Disease Mechanisms
- Cardiac Imaging and Diagnostics
- Radiation Detection and Scintillator Technologies
- Digital Radiography and Breast Imaging
- Radiology practices and education
- Medical Image Segmentation Techniques
- Radiomics and Machine Learning in Medical Imaging
- Thyroid Cancer Diagnosis and Treatment
- Nuclear Physics and Applications
- Management of metastatic bone disease
- Radiation Effects and Dosimetry
- Radiopharmaceutical Chemistry and Applications
- Ultrasound and Hyperthermia Applications
- Prostate Cancer Treatment and Research
Ludwig-Maximilians-Universität München
2017-2023
Universidad Nacional de Colombia
2013-2022
University Hospital Heidelberg
2011-2018
Heidelberg University
2011-2018
Maastro Clinic
2018
Maastricht University
2018
LMU Klinikum
2017
Instituto Nacional de Cancerología
2008
Intensity modulated radiation therapy (IMRT) and volumetric arc (VMAT) are relatively complex treatment delivery techniques require quality assurance (QA) procedures. Pre-treatment dosimetric verification represents a fundamental QA procedure in daily clinical routine therapy. The purpose of this study is to develop an EPID-based approach reconstruct 3D dose distribution as imparted virtual cylindrical water phantom be used for plan-specific pre-treatment IMRT VMAT plans. For each depth, the...
Purpose: Evaluation of the potential for radiation exposure reduction replacing static computed tomography (CT) beam-shaping filter geometry by a dynamically adapted to attenuation objects elliptic cross-section in dependence fan and projection angle. Materials Methods: The geometrical shape bowtie CT system has been determined from primary X-ray spectra (120 kV <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> ) measured at different...
The radiotracer called 68Ga-labelled Glu-urea-Lys(Ahx)-HBED-CC ([68Ga]Ga-PSMA-HBED-CC) is a novel radiophar-maceutical for the detection of prostate cancer lesions by positron emission tomography (PET) imaging. Setting up cost-effective manual synthesis this and making its clinical translation in Colombia will require two important elements: evaluation procedure to yield consistent product, meeting standards radio-chemical purity low toxicity then, radiation dosimetry. In paper protocol...
Purpose: Compton spectroscopy is a widely accepted tool for measuring the primary X-ray spectra of diagnostic computed tomography (CT) system.The aim this work to spectroscopically detect CT photons subjected 90-degree scattering accurate modelling beam-shaping filtration, which necessary computation radiation exposure and other research applications in medical physics.Methods: For tube potential 120 kVp have been measured under fan angles 0° 20° steps 2° at 21° from central ray.At each...
Purpose: CT bowtie filters modulate X‐ray intensity across the fan beam, compensating for decreasing absorption due to shorter path lengths through patient body periphery. The effect of replacing static beam‐shaping filter geometry by a dynamically adapted attenuation objects elliptic cross‐section has been evaluated with regard its potential signal homogenization and radiation exposure reduction. Methods: A theoretical model that adapts profile subjects as function fan‐and projection‐angle...
Ziele: Quantitative Analysen von Bilddaten erfordern Stabilität und herstellerübergreifende Vergleichbarkeit der Bildqualität. Vor diesem Hintergrund wurden Bildqualität Strahlenexposition zweier moderner Mehrzeilendetektor-CTs (MDCT) für standardisierte Akquisitionsparameter quantitativ verglichen. Methode: eines Wasser- (Ø=40cm) Bildqualitätsphantoms (Siemens ConeBeam Phantom, QRM) mittels 64-Zeilen Dual-Source CT mit Springfokus (Somatom Definition Flash, Siemens) 128-Zeilen MDCT...
Ziele: MDCT beam-shaping filters modulate X-ray beam intensity across the fan, compensating for decreasing absorption due to shorter path lengths through patient body periphery compared its center. The effect of replacing static filter geometry by dynamically adapted elliptical specimen in dependence projection angle has been evaluated with regard potential radiation exposure reduction. Methode: Using a Compton spectrometer, primary spectra (120kVp) have measured at different angular...
Purpose: with the purpose of determining iodine 131 biodistribution in patients thyroid cancer, a patient‐specific dosimetry protocol was developed and applied, using administration tracer amount this radionuclide methodology Medical Internal Radiation Dose. The method consists determination maximum tolerated activity that will deliver 2 Gy to blood, corresponding ablative lesion dose. Method Materials: Fifteen thyroid‐stimulating hormone (TSH) level 30 mU/L suppressed diet were orally...
Purpose or ObjectiveOur research group has developed and benchmarked water-equivalent electronic portal imaging devices (WE-EPID) for dosimetry of conventional flattening filter (FF)
La irradiación corporal total (TBI, por sus siglas en inglés) es una terapia previa al trasplante de médula ósea la que se administra dosis radiación uniforme todo el cuerpo del paciente, busca minimizar entregada diferentes órganos como pulmones y, algunas ocasiones, riñones [1]. En Colombia TBI con rayos X generados acelerador lineal realiza técnica convencional, cual paciente mantiene posición anatómica pie, fetal o decúbito lateral durante tiempos prolongados, lo implica tratamiento para...