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wizyta

od 2020-09-20

Dr Janusz Hankiewicz  | 1996-10 <> 2002-01

Adiunkt

  7006917667  

Publikacje      Projekty           Magistrowie           Seminaria


11.

Hankiewicz J., Kempka M., Fiat D.

In vivo natural-abundance 17O/1H MRI of Rhesus monkey brain with whole-body scanner and homebuilt multinuclear accessory The construction of an accessory to commercial whole-body magnetic resonance imaging (MRI) scanners that provides multinuclear capability is described. The multinuclear system has access to all clinical pulse sequences and is not limited by the frequency range of the commercially available "spectroscopic package". The accessory was used for O-17 studies with a homebuilt birdcage resonator and a low-noise preamplifier. In vivo O-17 images of a rhesus monkey brain were obtained. The homebuilt birdcage was transparent to radio-frequency irradiation of the scanner's body coil at H-1 frequency allowing consecutive acquisitions of H-1 and O-17 images and their superposition. The results demonstrate the potential of O-17/H-1 imaging with whole-body scanners.

Applied Magnetic Resonance, 24(3-4), 393-400 (2003)

DOI: 10.1007/BF03166941


10.

Kempka M., Hankiewicz J., Fiat D.

Combined 17O/1H MRI study in a whole-body scanner A simple method of obtaining consecutive H-1 and natural-abundance O-17 images is described with a scanner's original body resonator (for H-1) and a homemade linear birdcage (for O-17). Two kinds of experiments were performed to test the method. In the first experiment, a proton image of the phantom was acquired with a whole-body resonator. In the second experiment, the phantom was inserted into an oxygen birdcage resonator and imaged again with a whole-body resonator. The intensities of images resulting from the experiments were analyzed. Although the B-1 field homogeneity is disturbed, the proton images acquired with a whole-body resonator when the oxygen resonator is present are of acceptable quality for use in the combined O-17/H-1 imaging.

Applied Magnetic Resonance, 24(3-4), 409-415 (2003)

DOI: 10.1007/BF03166943


9.

Hankiewicz J.H., Pająk Z., Murakhowski A.A.

Nuclear magnetic resonance in Ba3Co2Fe24O41 ferrite The NMR in the Co2Ba3Fe24O41 hexaferrite has been studied between 4.2 and 292 K. Well-resolved lines originating from the resonance of 57Fe nuclei located in non-equivalent sites were obtained. The correlation between the spin-reorientation magnetic phase transition and the observed disappearance of the lines points to the local character of the magnetocrystalline anisotropy.

Journal of Magnetism and Magnetic Materials, 101(1-3), 134-136 (1991)

DOI: 10.1016/0304-8853(91)90704-E


8.

Murakhowski A.A., Gorbacz W.N., Hankiewicz J.H.

Spin reorientation in Co1.5Ni0.5Sr-W hexagonal ferrite Ferromagnetic resonance (FMR) studies of single-crystal Co1.5Ni0.5SrFe16O27 (Co1.5Ni0.5-W) hexagonal ferrite at 27 GHz have been performed. From the angle dependence of the resonance field in the temperature range of 77-380 K, the thermal behavior of the magnetocrystalline anisotropy constants K1, K2 and K3 has been observed. The regions of spin reorientations and various types of anisotropies related to them have been determined.

Journal of Magnetism and Magnetic Materials, 101(1-3), 131-133 (1991)

DOI: 10.1016/0304-8853(91)90703-D


7.

Bara J.J., Bogacz B.F., Hankiewicz J., Pająk Z., Radomski J.

Mossbauer effect and NMR studies of copper-cadmium ferrites Hyperfine magnetic field distributions have been observed at room temperature in Cd x Cu1−x Fe2O4 (0≤x≤0.5) ferrites by the Mössbauer and NMR methods and are explained by statistical distributions of metallic ions separately within A and within B crystal sublattices.

Hyperfine Interaction, 54(1), 453-457 (1990)

DOI: 10.1007/BF02396071


6.

Hankiewicz J., Pająk Z., Radomski J.

Low temperature NMR study of cadmium-substituted copper ferrite NMR spectra of CdxCu1−xFe2O4 (0≤ x ≤ 0.30) in liquid helium bath have been obtained in the frequency range of 50 to 110 MHz using the spin-echo technique. Influence of substitution of Cu2+ ions by Cd2+ ions on effective magnetic fields at 57Fe nuclei has been found only at octahedral sites.

Journal of Magnetism and Magnetic Materials, 83(1-3), 475-477 (1990)

DOI: 10.1016/0304-8853(90)90592-E


5.

Hankiewicz J., Onyszkiewicz I., Pająk Z., Radomski J.

NMR study of local magnetic properties of beryllium substituted copper ferrite The spin echo NMR spectra of57Fe have been taken at 77 K to describe the local magnetic properties of beryllum substituted copper ferrite Cu1−xBexFe2O4 for 0≤x≤0.2. From the spectra the concentration dependence of hyperfine magnetic fields for tetrahedral and octahedral sites have been derived. The results show that statistical distribution of beryllium atoms over magnetic sublattices takes place and suggest that only below x=0.2 solid solutions of beryllium copper ferrites can exist.

Hyperfine Interaction, 59(1), 349-352 (1990)

DOI: 10.1007/BF02401245


4.

Hankiewicz J., Pająk Z., Radomski J.

Low temperature NMR study of cadmium-substituted copper ferrite NMR spectra of CdXCu1−xFe2O4 /0≤x≤0.30/ at liquid helium temperature have been obtained in the frequency range of 50 to 110 MHz using the spin-echo technique. Influence of substitution of Cu2+ ions by Cd2+ ions on effective magnetic fields at57Fe nuclei has been found only at octahedral sites.

Hyperfine Interaction, 59(1), 345-348 (1990)

DOI: 10.1007/BF02401244


3.

Hankiewicz J., Pajak Z., Krupotkin M.

57Fe NMR, magnetization and X-ray study of Cd0.1Cu0.9Fe2O4 ferrite 57Fe NMR spin-echo spectra, static magnetization and X-ray diffraction measurements for Cd0.1Cu0.9Fe2O4 ferrite taken in a wide range of temperatures are presented. The X-ray studies show that above 100 K the structure is cubic. The temperature dependence of the effective magnetic field acting on 57Fe nuclei at non-equivalent tetrahedral and octahedral sites has been determined. Different thermal behaviour of the magnetic field at both sublattices and of the specific macroscopic magnetization have been found. Magnetization measurements imply that cadmium substitution does not affect the ferric ion distribution between the sublattices of the ferrite.

Journal of Magnetism and Magnetic Materials, 89(3), 315-321 (1990)

DOI: 10.1016/0304-8853(90)90743-A


2.

Hankiewicz J., Pająk Z., Radomski J.

Acta Physica Polonica A, 76(1), 63-68 (1989)


1.

Hankiewicz J., Lewicki S., Pająk Z.

Simple gated integrator for transient recording A simple low cost integrator is described, which not only allows transient recording but also improves the signal-to-noise ratio. Periodic zeroing and three-stage gating of the integrator reduces its drift and avoids sampling rate limitations.

Journal of Physics E: Scientific Instruments, 19(4), 260-262 (1986)

DOI: 10.1088/0022-3735/19/4/001


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