 Digital Mammography  X ray tests  Phantoms spectra  Bilateral Project (ICM-tube X-ray) Development of a silicon detector for photon counting to be.

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Presentation transcript:

 Digital Mammography  X ray tests  Phantoms spectra  Bilateral Project (ICM-tube X-ray) Development of a silicon detector for photon counting to be used in dual energy radiography in the range 18-40KeV

Digital Mammography Vantages: Better resolution Image manipulation Image Inversion Identification of other tissues Reduction of time in studies (half)

Silicon strip detector

Characteristics of SD Position identification Energy 8-30 KeV Spatial resolution um Fast electronics Low noise Low dose

Silicon strip detector Key system issues Fully parallel signal processing for all channels. Only binary (yes/no) information is extracted from each strip. Data from each channel must be stored in a local buffer for the whole measurement period. 64 bond wires PC computer

First prototype (1xRX64) 0.6  1.0 cm 2 detector RX64

Detector Tests Calibration through an internal pulse to obtain gain and noise estimation of the system Calibration through radiactive sources to obtain gain, noise and the absolute energy scale Detector test using a X ray tube at CINVESTAV and a mammograph at Hospital Juárez Obtain spectra with phantoms made in laboratory and an official phantom (ACR).

Calibration with radiation sources

Gain of 64 channels

Hospital Juárez-México Fis. Enrique Gaona (UAM-Xochimilco)

Scanning system – 2D image Advantages compare to 2D-systems: -reduced scatter background, -small number of the electronics channel. scanning slit

Activities in Mexico Caracterization and tests in hospital by A. Leyva (posdoc ALFA). -Simulation of the system by a portuguese student (ALFA). -Test with ACR phantom by Roxana de la Mora (Bil. Proj. Cuba)

Phantom 1 (First tests) Colimator: 250um Steps: 2 Time: 3600s/step Cd-109 (22,24keV)

Semiconductor diode Image Colimador: 1mm Pasos: 16 Tiempo: 600s/paso Cd-109 (22,24keV)

Internal image LED Collimator: 1mm Steps: 26 Time: 3600s/step Cd-109 (22,24keV)

Structures Images with Cd-109 Collimator: 0.5mm Steps: 26 Time: 2400s/step Cd-109 (22,24keV)

ACR Phantom The ACR phantom has structures that simulate microcalcifications of several sizes.

Internal details

BEDE X ray Tube Anode: Cu, window: Be ICM Project

Spectrum (64 strips) phantom 1 X ray tube

Mass profile (13) X ray tube mass 1mm

Characteristics of mammograph in Hospital Juárez Elscint, made in Israel Model MAM-CH225 X ray tube model : XRHAVA Range: kV Automatic adjustment of current Anodo-filter: Mo/Mo

Detail 12 and phantom 1 First results mass 2mmPhantom 1 Time:0.8s, 28kV, 90 mAs

International Collaboration

Publication

Biological Tissue (uterus) Analysis in progress …

Activities-Ricardo 1(*)- Estudio de: a) Interacción de las radiaciones con la materia. b) Detección de las radiaciones ionizantes. d) Detectores semiconductores de silicio 2- Calibración 2 chips RX64. a) Determinación de la linealidad de los contadores. b) Determinar Ampl DAC y Shaper DAC para el sistema. c) Medición de la ganancia, offset y el ruido.

Activities… 3- Calibración energética del sistema de detección empleando fuentes patrones radioactivas. 4- Obtención de imágenes de objetos en el laboratorio 5- Simulacion del sistema con Geant

Activities done so far 1- Study of radiation interaction with matter (silicon) (*) 2- Study simulation programs (Litrani, Geant) (*) 3- Measurement of gain, noise and offset through calibration pulse and radiation sources. (see report) 4- Programs to obtain mean and sigma of data (developed in C) (*) * Should be in the report

Future activities… Most of the measurement done sofar with edge-on configuration Poisson test. Biológical tissues measurementwith both front and edge on configutations. Measurements with X ray tube and Mammograph.