Evaluation of a telemetric temperature sensor for deep hyperthermia application

Radiation Oncology, Biology, Physics

202

1

October 1990, Volume 19, Supplement

149 EFFECT

OF SURFACE

Croghan,

M.K.,

Radiation

WARYING

Shimm,

Oncology

We Helix

have

treated

with of

difference

41.S”

C

ware

in

for

pts to

mean

Anhslt,

Health

deep

79.2

and

82.8 were

placed

or

with

rater

1)

C

in

warmed,

delivered

906W

for

nean

group

time

1

as

averaged

a

S.S.,

Fletcher.

The

of goal

between

pelvic

to

740W

and

and

in 2

Mean

463W

for

vaginal)

86724

using to

pts

CDRH tumor were

2).

The

(group power

and

Table

2.

systemic

T.C.

which

(group

patients

group

a

obtain

blankets 9

peak

and

Cetas,

USA

pelvis

water

addition

S.H.,

was

C

mask. and

AZ

treatments

46.0-47O In

(rectal

abdomen

circulating

oxygen

Dyet,

Tucson,

all

to

blankets.

compared

the

of

heated

standard

A.M.,

Center,

heating

MHz.

cotton

through

HYPERTHERYIA

Sciences

regional

Patients (group

wrapped 0

and

Arizona

Dean,

with

wera

maximum

D.P.,

(pts)

pts

and

of

min.

20

41-42

1000W

K.H.,

REGIONAL-SYSTEYIC

between 30-60

in

2

RECEIVING

University

patients

water

warmed

power

Hynynen,

frequency

group

air

averaged

a

cold

extremities humidified

29

at 1

perfused

D.S.,

Department,

operating

temperatures

ON PATIENTS

3)

received

mean

time

1

shows

the

(oral)

temperaturas.

Oral

Temperature

Mean

Maximum

Mean

Time

Pelvic

There

was

Maximum

Mean

Time

increased

temperatures

141.60

Overal

I,

41.4

39.9

40.9

40.9

41.9

42.1

(OC)

40.2

41.6

41.9

(OC)

Averaged

difference

temperatures

surface

40.4

39.4

Temperature

Mean

no

39.7 (OC)

(OC)

Averaged

by C

heating

decreased

more

homogeneous

ware

in 1.2

o

toxicity C

and

between 2.S”

consistently power

C

obtained

requirements

systemic

the

temperatures

3

groups.

respectively only

while

in

group

increasing were

Mean

between

obtained

time

group 2

and

averaged 1

and

group

pelvic

group 3

3.

patients.

both

regional

and

when

surface

warming

and Regional In

systemic

oral pelvic

conclusion,

temperatures.

techniques

were

employed.

150 EVALUATION APPLICATIONS

OF

A

TELEMETRIC

B.B. Mittal, M.D., V. Sathiaseelan, and W. N. Brand, M.D.

TEMPERATURE

Ph.D.,

A.W.

Rademaker,

SENSOR

FOR

Ph.D' , M.C.

Radiation Oncology Center, Department of Radiology and ‘Cancer Center Biometry Medical School and Northwestern Memorial Hospital, Chicago, IL 60611

DEEP

Pierce, Section,

HYPERTHERMIA

P.M.

Johnson,

Northwestern

Ph.D., University

We have investigated the potential of an ingestable/implantable telemetric temperature monitoring system (IITMS) for deep tissue temperature determination with the BSD-2000 annular phased array deep heating system. The ingestable/implantable capsule sensor uses radio pill technology and contains a temperature sensitive quartz crystal oscillator. The telemetered signal is inductively coupled by a radiofrequency coil system to an external receiver. The sensors, covered with a protective silicon coating, are IO mm in diameter and 20 mm long and are energized by an internal silver-oxide battery. Experimental studies were carried out to investigate the accuracy of the system and the extent of reliable operation of these sensors in an electromagnetic environment. Different measurements were repeated for five sensors. Calibration accuracy was verified by comparing with a Bowman probe in the temperature range 30 to 55 ‘C. Linear regression analysis indicated a correlation within f0.4’C at 95% prediction intervals. Response times were determined by exponential fit of heat-up and cool-down curves for each pill. All curves had correlation coefficients greater than 0.98 (p