Focused Array Hyperthermia Applicator: Theory and Experiment

Gee, W.; Lee, Shung-Wu; Bong, Nelson K.; Cain, Charles A.; Mittra, R.; Magin, Richard L.

doi:10.1109/tbme.1984.325368

Cited by 88 publications

(29 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the challenging requirements for these devices (e.g., the ability to focus the field and modify the absorbed power distributions during use, while being light and compact) have addressed the efforts towards the design of array configurations, where a suitable choice of the amplitude and phase of the excitations makes it possible the realization of desired radiation patterns. Hence, applicators based on different kind of linear [6,7], planar [8], hexagonal [9], circular [10,11], cylindrical [12], spherical [13], elliptically bent [14] and annular arrays [15] have been considered in the literature. More recently, other solutions have been considered, such as the use of left-handed metamaterials to improve focusing capabilities in shallow tumors treatments [16], or the adoption of deformable mirrors [17] or ultra-wide-band beamformers [19,20] in breast cancer therapy.…”

Section: Introductionmentioning

confidence: 99%

Optimal Constrained Field Focusing for Hyperthermia Cancer Therapy: A Feasibility Assessment on Realistic Phantoms

Iero¹,

Isernia²,

Morabito³

et al. 2010

PIER

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Optimal Constrained Field Focusing for Hyperthermia Cancer Therapy: A Feasibility Assessment on Realistic Phantoms

Iero¹,

Isernia²,

Morabito³

et al. 2010

PIER

View full text Add to dashboard Cite

“…The total electric field E t at the observation point P (x, y, z) due to entire array [2] is given by…”

Section: Total Near Electric Field and Sar Value Due To Conformal Phamentioning

confidence: 99%

“…Fig. 3 shows the relative SAR contour (in dB) focused [2] at the point (0 cm, 3.5 cm, z = 2 cm) by calculating phase due to each slot of the array with the help of Eqn. (19) for elliptically bent conformal array.…”

Section: Figurementioning

confidence: 99%

“…Fig. 8 shows the −3 dB contour SAR distribution (in dB) focused [2] at the point (0 cm, 3.5 cm, z = 2 cm) for elliptically and circularly bent conformal phased arrays and planar array. In this case, amplitude excitation of each slot of array under study is kept uniform.…”

Section: Figurementioning

confidence: 99%

“…A number of studies on array configurations using different types of applicators for hyperthermia treatment of cancer have been reported in the literature [2][3][4][5][6][7][8][9][10], such as linear array [2,3], planar array [4], hexagonal array [5], circular/ring array [6,7], cylindrical array [8], spherical array [9], annular phased array [10] and many other array configurations using waveguides, horns etc.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Elliptically Bent Slotted Waveguide Conformal Focused Array for Hyperthermia Treatment of Tumors in Curved Region of Human Body

Gupta¹,

Singh²

2006

PIER

View full text Add to dashboard Cite

Abstract-In present paper, a novel and effective hyperthermia applicator utilizing an elliptically bent conformal array of longitudinal slots in narrow wall of rectangular waveguide is analyzed by two different approaches, viz., the vector potential method and FresnelKirchhoff scalar diffraction field theory. The agreement between two theories is reasonably very good. This configuration is mainly intended as a specialized and very effective applicator for hyperthermia treatment of tumor within curved portions of human body such as abdomen, neck, chest etc. Each slot of the conformal array is excited by a coaxial line probe. It is proposed that the interior of the waveguide be filled with water to provide a good impedance match with the bio-medium. The contour distribution of specific absorption rate (SAR) in x-z plane, SAR distribution in y-direction and parameters such as penetration depth, power absorption coefficient, effective field size (EFS) due to the conformal array as well as single slot are evaluated and compared at 433 MHz. The results for contour SAR distribution at 433 MHz for elliptically bent conformal array are also compared with those for other array configurations such as circularly bent conformal array and planar array. The effect of change in phase and amplitude excitation of each slot of the array on SAR distribution is also examined. The results demonstrate that slotted waveguide conformal array offers marked improvement in SAR distribution and penetration depth over single slot. It also has better focusing ability as compared with planar array for controlled amplitude and phase excitations of the elements. 108 Gupta and Singh

show abstract