A Method to Detect Dynamic Characteristics of Small Biological Soft Tissues and Its Application to Human Prostate Tissue.

Kosawada, Tadashi; Hamaguchi, Ryota; Suzuki, Yukihiro; Kubota, Yohko; Nakada, Teruhiro; Suzuki, Katsuyoshi; Shikanai, Genji

doi:10.1299/kikaic.61.4410

Cited by 3 publications

(2 citation statements)

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“…The palpation depends on the tactile perception of the forefinger, which is said to be ambiguous, subjective and much affected by the physician's experience. This situation has drawn interest in the development of objective instrumentation that measures and evaluates the stiffness of flexible soft materials [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Development of an active palpation sensor for detecting prostatic cancer and hypertrophy

Tanaka

Furubayashi

Tanahashi

et al. 2000

Smart Mater. Struct.

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This paper is concerned with the development of an active palpation sensor for detecting prostatic cancer and hypertrophy. The receptor of the sensor is a polyvinylidene fluoride (PVDF) film placed on the surface of a sponge rubber layer. It is mounted on a linear z-translation bar and inserted into the examinee's rectum whilst being protected by a medical rubber glove. After being positioned to face the prostate gland, the sensor probe is driven sinusoidally at about 50 Hz, with a peak-to-peak amplitude of 2 mm. The voltage signal from the PVDF film is integrated over the sampling period and is used as the output of the sensor for extracting the features of the collected data. The evaluation of the stiffness by the sensor on 27 normal and unhealthy prostate glands are compared with the results of diagnosis by the doctor's palpation. It is shown that the output of the sensor becomes greater with an increase of the stiffness of the prostate gland, which has a good correlation with the doctor's evaluation on the stiffness. Further results on the laboratory test reconfirm that the present sensor well discriminates the stiffness of the prostate glands in vivo and non-invasively.

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Section: Introductionmentioning

confidence: 99%

Development of an active palpation sensor for detecting prostatic cancer and hypertrophy

Tanaka

Furubayashi

Tanahashi

et al. 2000

Smart Mater. Struct.

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show abstract

“…As for hardness measurement of prostate, Kosawada, et al [5] tried to evaluate the dynamic characteristics of prostate tissue using a miniature cantilever beam. In this study comes that the pathological changes in prostate would give an alteration in its viscoelasticity; hence the property of the prostate tissue could be characterized by measuring the damped vibration of the miniature cantilever at tip of which is touched by the prostatic tissue.…”

Section: Introductionmentioning

confidence: 99%

Development of Soft Tactile Sensor for Prostatic Palpation Diagnosis: Sensor Structure Design and Analysis

Jiang

Chonan

Tanahashi³

et al. 1999

Shock and Vibration

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This paper is concerned with the development of a palpation probe for assessment of prostatic cancer and hypertrophy. The sensor is constructed by layering two polivinylidene fluoride (PVDF) films into soft material layers such as vulcanized rubber and sponge rubber sheets. Since the contact condition between the sensor and soft objects influences the sensor output significantly, the improvement of its sensitivity is investigated by design of an attachment covered over the sensor surface. In this report, the theoretical model of the sensor and the design of the attachment are presented and the attachment is validated for soft substances due to experimental investigation. Finally, a compact probe developed for clinical testing is presented and the data obtained from the patients are treated by the wavelet transform for de-noising. Some representative clinical data show that the sensor could be a useful tool for group medical checkup on prostatic cancer and hypertrophy.

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Development of a palpation sensor for detection of prostatic cancer and hypertrophy (optimum structural design of sensor)

Chonan

江

Tanaka

et al. 1998

International Journal of Applied Electromagnetics and Mechanics

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This paper is concerned with the development of a soft palpation sensor for detection of prostatic cancer and hypertrophy. The sensor is a layered medium with two polyvinylidene fluoride (PVDF) films embedded in the matrix sponge rubber. It is pressed against the prostates and the output voltage signals from the polymer films are measured. The temporal mean values, {I}_1 and {I}_2 , of absolute voltage signals from the films are calculated and their ratio {I}_1/{I}_2 is used as the sensor output. First, the fundamental characteristics of a rectangular sensor with a plane surface are examined. Then, the surface geometry of the sensor was designed so that it clearly indicates the nature on the stiffness of the soft material. Finally, a compact cylindrical sensor attached to the doctor’s forefinger is described and experimental studies of its performance as a palpation sensor are presented. Some representative clinical data on the normal and hardened prostate glands are also presented.

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A Method to Detect Dynamic Characteristics of Small Biological Soft Tissues and Its Application to Human Prostate Tissue.

Cited by 3 publications

References 0 publications

Development of an active palpation sensor for detecting prostatic cancer and hypertrophy

Development of an active palpation sensor for detecting prostatic cancer and hypertrophy

Development of Soft Tactile Sensor for Prostatic Palpation Diagnosis: Sensor Structure Design and Analysis

Development of a palpation sensor for detection of prostatic cancer and hypertrophy (optimum structural design of sensor)

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