Application of the condenser lens in microwave hyperthermia

2010 ◽  
Vol 54 (1) ◽  
pp. 237-243
Author(s):  
Bing Sun ◽  
GuoTai Jiang ◽  
ZhiHong Chen ◽  
Li Wang
Keyword(s):  
Condenser Lens ◽  
Microwave Hyperthermia

Description of a New High Resolution Scanning Transmission EM

1972 ◽  
Vol 30 ◽  
pp. 418-419
Author(s):  
Michael Beer ◽  
J. W. Wiggins ◽  
David Woodruff ◽  
Jon Zubin
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Energy Dispersive Spectrometer ◽  
Scanning Transmission Electron Microscope ◽  
Objective Lens ◽  
Condenser Lens ◽  
Transmission Electron ◽  
Pattern Size ◽  
Scanning Transmission ◽  
Under Construction

A high resolution scanning transmission electron microscope of the type developed by A. V. Crewe is under construction in this laboratory. The basic design is completed and construction is under way with completion expected by the end of this year.The optical column of the microscope will consist of a field emission electron source, an accelerating lens, condenser lens, objective lens, diffraction lens, an energy dispersive spectrometer, and three electron detectors. For any accelerating voltage the condenser lens function to provide a parallel beam at the entrance of the objective lens. The diffraction lens is weak and its current will be controlled by the objective lens current to give an electron diffraction pattern size which is independent of small changes in the objective lens current made to achieve focus at the specimen. The objective lens demagnifies the image of the field emission source so that its Gaussian size is small compared to the aberration limit.

A Newly Designed 650kv Electron Microscope

1968 ◽  
Vol 26 ◽  
pp. 304-305
Author(s):  
K. Shiraishi ◽  
T. Katsuta ◽  
S. Ozasa ◽  
H. Todokoro
Keyword(s):  
Electron Microscope ◽  
High Voltage ◽  
Bright Field Image ◽  
Bright Field ◽  
Push Button ◽  
Condenser Lens ◽  
High Voltage Generator ◽  
Frequency Power ◽  
Better Than ◽  
Illuminating System

We have recently completed a newly designed 650KV electron microscope. An external view of this advanced instrument is shown in Figure 1. A symmetrical Cockcroft-Walton circuit has been adopted as the high voltage generator. The cathode is heated by high frequency power; a battery is not employed. The high voltage stability is better than 1 x 10-5/min.The sectional diagram of the column shown in Figure 2 is 420mm in diameter and 2750mm in height. The illuminating system consists of a double condenser lens and a magnetic alignment device. Dual deflector assemblies for dark and bright field images, selectable by push button, are built beneath the condenser lens. Two selectable stigmator power supplies are also provided for dark and bright field image operation.

Optical characteristics of the hitachi HF-2000 cold field-emission TEM

1993 ◽  
Vol 51 ◽  
pp. 1076-1077
Author(s):  
L. F. Allard ◽  
E. Völkl ◽  
T. A. Nolan
Keyword(s):  
Field Emission ◽  
Recent Literature ◽  
Electron Gun ◽  
High Brightness ◽  
Condenser Lens ◽  
Illumination System ◽  
High Resolution Images ◽  
Imaging Mode ◽  
Better Than ◽  
Illuminating System

The illumination system of the cold field emission (CFE) Hitachi HF-2000 TEM operates with a single condenser lens in normal imaging mode, and with a second condenser lens excited to give the ultra-fine 1 nm probe for microanalysis. The electron gun provides a guaranteed high brightness of better than 7×l08 A/cm2/sr, more than twice the guaranteed brightness of Schottky emission guns. There have been several articles in the recent literature (e.g. refs.) which claim that the geometry of this illumination system yields a total current which is so low that when the beam is spread at low magnifications (say 10 kX), the operator must “keep his eyes glued to the binoculars” in order to see the image. It is also claimed that this illuminating system produces an isoplanatic patch (the area over which image character does not vary significantly) at high magnification which is so small that the instrument is ineffective for recording high resolution images.

Prediction of tumor heatability in microwave hyperthermia applicators

2018 ◽  
Author(s):  
P. Takook ◽  
E.K. Erika ◽  
E. Eskilsson ◽  
H.D. Trefna ◽  
M. Persson
Keyword(s):  
Microwave Hyperthermia

scholarly journals Microwave hyperthermia treatment increases heat shock proteins in human skeletal muscle * COMMENTARY

2007 ◽  
Vol 41 (7) ◽  
pp. 453-455 ◽  
Author(s):  
Y. Ogura ◽  
H. Naito ◽  
T. Tsurukawa ◽  
N. Ichinoseki-Sekine ◽  
N. Saga ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Heat Shock ◽  
Heat Shock Proteins ◽  
Human Skeletal Muscle ◽  
Hyperthermia Treatment ◽  
Shock Proteins ◽  
Microwave Hyperthermia

Normal brain response after interstitial microwave hyperthermia

1991 ◽  
Vol 7 (5) ◽  
pp. 795-808 ◽  
Author(s):  
J. R. Fike ◽  
G. T. Gobbel ◽  
T. Satoh ◽  
P. R. Stauffer
Keyword(s):  
Normal Brain ◽  
Brain Response ◽  
Microwave Hyperthermia

Evaluation of microwave hyperthermia applicators

1992 ◽  
Vol 13 (6) ◽  
pp. 581-597 ◽  
Author(s):  
C.-K. Chou
Keyword(s):  
Microwave Hyperthermia

A printed Yagi–Uda antenna for application in magnetic resonance thermometry guided microwave hyperthermia applicators

2017 ◽  
Vol 62 (5) ◽  
pp. 1831-1847 ◽  
Author(s):  
M M Paulides ◽  
R M C Mestrom ◽  
G Salim ◽  
B B Adela ◽  
W C M Numan ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Thermometry ◽  
Microwave Hyperthermia

scholarly journals Phase Compensation Technique for Effective Heat Focusing in Microwave Hyperthermia Systems

2021 ◽  
Vol 11 (13) ◽  
pp. 5972
Author(s):  
Seonho Lim ◽  
Young Joong Yoon
Keyword(s):  
Target Area ◽  
Phase Compensation ◽  
Temperature Changes ◽  
Multiple Tumor ◽  
Beam Focusing ◽  
Cancerous Cell ◽  
Multifocal Breast Cancer ◽  
Compensation Technique ◽  
Circular Antenna Array ◽  
Microwave Hyperthermia

In this paper, effective electromagnetic (EM) focusing achieved with a phase compensation technique for microwave hyperthermia systems is proposed. To treat tumor cells positioned deep inside a human female breast, EM energy must be properly focused on the target area. A circular antenna array for microwave hyperthermia allows EM energy to concentrate on a specific target inside the breast tumor. Depending on the cancerous cell conditions in the breast, the input phases of each antenna are calculated for single and multiple tumor cell locations. In the case of multifocal breast cancer, sub-array beam focusing via the phase compensation technique is presented to enhance the ability of EM energy to concentrate on multiple targets while minimizing damage to normal cells. To demonstrate the thermal treatment effects on single and multiple tumor locations, the accumulation of the specific absorption rate (SAR) parameter and temperature changes were verified using both simulated and experimental results.

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