Mr. Hugo J. Spruijt Profile

Hugo J. Spruijt

Clinical Physicist at VU Medisch Ctr

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Publications (4)

Proceedings Article | 24 April 2002 Paper

Three-dimensional representation of integration of functional coronary angiograms and nuclear cardiac imaging

Hugo Spruijt, Andreas Wahle, Koen Marques, Nico Westerhof, Robert Heethaar, Jean Bronzwaer, Frans Visser

Proceedings Volume 4683, (2002) https://doi.org/10.1117/12.463593

KEYWORDS: Single photon emission computed tomography, Angiography, Arteries, 3D image processing, Image fusion, 3D modeling, X-rays, 3D acquisition, Visualization, Cardiac imaging

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Proceedings Article | 27 January 1997 Paper

Low-noise InGaAs infrared 1.0- to 2.4-um focal plane arrays for SCIAMACHY

Ronald van der A, Ruud Hoogeveen, Hugo Spruijt, Albert Goede

Proceedings Volume 2957, (1997) https://doi.org/10.1117/12.265456

KEYWORDS: Sensors, Diodes, Indium gallium arsenide, Temperature metrology, Interference (communication), Staring arrays, Electronics, Signal detection, Quantum efficiency, Electrons

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Proceedings Article | 15 December 1995 Paper

Near-infrared focal-plane arrays for SCIAMACHY

Ruud Hoogeveen, Hugo Spruijt, Bart Broers, Avri Selig

Proceedings Volume 2583, (1995) https://doi.org/10.1117/12.228606

KEYWORDS: Sensors, Staring arrays, Near infrared, Carbon monoxide, Silicon, Detector arrays, Gases, Mirrors, Multiplexers, Absorption

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Proceedings Article | 13 September 1994 Paper

Reflection grating spectrometer onboard the ESA x-ray multi-mirror (XMM) mission

Jan-Willem den Herder, Henry Aarts, Marcel van den Berg, Jay Bixler, Antonius den Boggende, Graziella Branduardi-Raymont, A. Brinkman, Todd Decker, Luc Dubbeldam, Charles Hailey, Fred Jansen, Steven Kahn, Piet de Korte, C. Mauche, Richard Montesanti, Frits Paerels, Hugo Spruijt, Knud Thomsen, Peter Verhoeve, Alex Zehnder

Proceedings Volume 2209, (1994) https://doi.org/10.1117/12.185279

KEYWORDS: Mirrors, Charge-coupled devices, X-rays, Roentgenium, Cameras, X-ray telescopes, Back illuminated sensors, CCD cameras, Spectral resolution, Telescopes

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The Reflection Grating Spectrometer (RGS) onboard the ESA satellite XMM (X-ray Multi Mirror mission) combines a high resolving power (approximately 400 at 0.5 keV) with a large effective area (approximately 200 cm²). The spectral range selected for RGS (5 - 35 angstroms) contains the K shell transitions of N, O, Ne, Mg, Al, Si and S as well as the important L shell transitions of FE. The resolving power allows the study of a wide variety of challenging scientific questions. Detailed temperature diagnostics are feasible as the ionization balance is a unique function of the distribution of the electron temperature. Density diagnostics are provided by studying He-like triplets where the ratio of the forbidden to intercombination lines varies with density. Other fields of interest include the determination of elemental abundances, the study of optical depth effects, velocity diagnostics by measuring Doppler shifts and the estimate of magnetic fields through the observation of Zeeman splitting. The resolving power is obtained by an array of 240 gratings placed behind the mirrors of the telescope, dispersing about half of the X-rays in two spectroscopic orders. The X-rays are recorded by an array of 9 large format CCDs. These CCDs are operated in the frame transfer mode. They are back illuminated as the quantum efficiency of front illuminated devices is poor at low energies because of their poly-silicon gate structure. To suppress dark current the CCDs are passively cooled. In order to obtain the effective area of about 200 cm², grating arrays and CCD cameras are placed behind two of the three XMM telescopes. A model of RGS was tested last autumn ('93) at the Panter long beam X-ray facility in Munich. The model consisted of a subset of four mirrors, eight representative gratings covering a small section of the inner mirror shells and a CCD camera containing three CCDs. The purpose of these tests was to verify the resolution and sensitivity of the instrument as a function of X-ray energy. Extensive simulations, using a Monte Carlo raytracing code, are used to interpret these tests. Preliminary results of these tests will be discussed and compared to the calculated response.

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