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At least 397 records · Page 22Linked to original sources

PubMed1975

Thermography in breast carcinoma: results of a blind reading trial.

This paper presents the results of a blind reading trial of thermographic detection of breast cancer. Thermograms from women with no known breast disease, those with benign disease and those with carcinoma have been analysed using a previously described method for examination and assessment. Each record was read blind by three observers and the resulting scores compared for the three groups of women. It was found that, using the scoring system devised, 69 per cent of carcinomas gave scores in the range considered to indicate a high risk of breast disease but that 33 per cent of the scores for the normals also fell into this range. No differentiation between benign and malignant groups could be achieved. A significant number of the carcinomas were also found to show few detectable signs on thermography, resulting in an appreciable false negative rate.

Body Temperature↗

PubMed1996

Infrared thermography. Its role in dental research with particular reference to craniomandibular disorders.

The use of infrared thermography in dentistry has been minimal, principally due to technological inadequacies of previous thermal imaging systems. However, with the ever-developing advancement in technology, current systems are capable of producing real-time, highly sensitive digitized thermal images. This development has led to an increased use of infrared imaging within both medical and dental research. The present paper describes these techniques and their previous applications within dentistry, and, through the use of a pilot study, highlights possible future applications in the assessment of craniomandibular disorders.

Adult↗

PubMed2006

Bioengineering assessment of acupuncture, part 1: thermography.

In Western society, acupuncture is becoming a popular complementary method to medical treatment. However, a scientific understanding of acupuncture has not been completely developed but will absolutely be necessary for the increased acceptance of acupuncture by the Western medical community. This first part of the review article describes, in a general introduction, milestones of acupuncture research within the last 30 years and in a specific part the possibilities and limitations of infrared thermography, a noninvasive biomedical engineering method, within acupuncture research.

Acupuncture Therapy↗

PubMed2004

Infrared video thermography: a technique for assessing cold adaptation in insects.

Insects can survive subzero temperatures by two main strategies: freeze tolerance and freeze avoidance. An array of techniques have been used to investigate the physiological limits of insects to low temperatures, such as differential scanning calorimetry, temperature-controlled cooling apparatus, thermocouples, and computer-controlled chart recording equipment. However, these techniques require animals to be stationary, precluding behavioral data. We used infrared video thermography to investigate cold adaptation in an alpine insect, expanding such investigations to include behavioral response as an indicator of physiological stress. This technique is noninvasive and provides a large amount of physiological information, such as supercooling points, lower lethal temperatures, and hemolymph melting points. Insect supercooling points in response to a constant cooling rate were variable; however, temperatures at the initiation of behavioral stress response were less variable. Assessments of supercooling points and lower lethal temperatures obtained in this way are more biologically meaningful because allowing unhindered movement of insects more closely resembles natural environments.

Adaptation, Physiological↗

PubMed1981

Fall in skin temperature during exercise observed by thermography.

Monochromatic and colored thermographies were used to visualize skin temperatures during exercise without involvement of sweating. Skin temperature began to fall immediately at the onset of exercise, remained low during exercise and rose rapidly after cessation of exercise. Increased work intensities produced a proportional fall in skin temperature and greater surface area of lowered temperature.

Adult↗

PubMed1990

[Heat distribution within the bone tissue by rotary cutting instrument for IMZ implant. Heat analysis by a real-time thermography].

A highly skilled surgical technic is an important factor for the success of implant. But the heat generation during bone preparation will greatly affect the healing process of bone and prognosis of implant. In this study, the heat occurrence and distribution during bone preparation which performed on an in vitro mandible model (ribs of pig) were considered with the aid of a real-time thermography. IMZ implant drills and bur, designed for cylindrical type implant were used for the bone preparation. The conclusion are as follows: 1. Any drill or bur generates higher heat without water irrigation. 2. Heat distribution produced different shape of range according to different type of drills. 3. On a relationship of preparating time to heat generation, spiral drill takes the longest time to complete drilling but heat rising ratio is slow. Round bur and Canon drill take short time to complete drilling but it is accompanied with rapid heat rising.

Animals↗

PubMed1982

Liquid crystal contact thermography of deep venous thrombosis.

A new thermographic technique for the diagnosis of deep venous thrombosis, liquid crystal contact color thermography using naturally occurring cholesteric crystals is described. Cholesteric crystals have the property of changing colors in consistent, predictable patterns in response to local temperature changes. The technique is reliable and reproducible. It has also been rendered simple by embedding the liquid crystals in elastic, flexible sheets. The sheets are inflated and readily adapt and contour to extremities of various sizes and shapes. Preliminary results have shown excellent correlation with ascending phlebography. The two methods were in agreement in 90% of cases with no false-negative liquid crystal thermograms. The technique shows promise as a noninvasive screening study for the diagnosis of deep venous thrombosis in high risk patients.

Aged↗

PubMed1991

Contact thermography of painful diabetic neuropathic foot.

OBJECTIVE: To investigate regional differences in skin blood flow (measured by contact thermography) in the diabetic neuropathic foot and to examine the effect of foot temperature on the severity of neuropathic pain. RESEARCH DESIGN AND METHODS: Thirty-five diabetic patients with painful polyneuropathy (PPN) and 33 healthy age- and sex-matched control subjects comprised the study. Mean foot temperature (MFT) in PPN (mean +/- SE 28.3 +/- 0.3 degrees C) was significantly higher (P less than 0.001) than in the control subjects (25.9 +/- 0.5 degrees C), with the highest temperatures over the metatarsal areas and heel. Visual analogue scale pain score (mean +/- SD 5.3 +/- 1.9 cm) did not correlate with MFT (r = -0.14, P = 0.52). In 10 patients with PPN followed for 2-8 mo (mean 4.6), MFT fell by 1.6 degrees C (P = 0.05), but pain scores did not alter. CONCLUSIONS: Neuropathic pain is unaffected by alterations in skin temperature. Elevated skin temperatures at recognized sites of weight bearing (metatarsal heads and heels) are common in the diabetic neuropathic foot and may indicate tissue injury or inflammation induced by pressure trauma or increased arteriovenous shunting. Follow-up studies will determine whether thermographic hot spots are more susceptible to ulceration.

Diabetic Neuropathies↗

PubMed1994

The prediction of diabetic neuropathic plantar foot ulceration by liquid-crystal contact thermography.

OBJECTIVE: To assess whether the development of plantar foot ulceration could be predicted from the mean plantar foot temperature (MFT), as assessed by liquid-crystal contact thermography (LCT), in patients with peripheral neuropathy. RESEARCH DESIGN AND METHODS: Fifty patients with painful diabetic sensorimotor neuropathy were studied prospectively. Initially, 30 patients had no significant peripheral vascular disease (PVD) (ankle:brachial systolic blood pressure ratio > 1.0). LCT was used to assess the MFT from eight standard plantar sites. RESULTS: Initial MFT was higher in the patients without PVD (28.2 +/- 2.9 degrees C, mean +/- SD) than in patients with PVD (25.6 +/- 1.9 degrees C, P < 0.001) and in nondiabetic control subjects (25.7 +/- 2.1 degrees C, P < 0.001). At review, on average 3.6 (range 3.0-4.1) years later, 11 patients had died (6 of whom had PVD), and one was lost to follow-up. Six patients (seven feet) from the group without PVD had developed neuropathic plantar foot ulcers. The initial MFT was significantly higher in these seven feet (30.5 +/- 2.6 degrees C) than in the 38 feet of the 19 survivors in this group (27.8 +/- 2.3 degrees C, P < 0.01). Only one patient with PVD developed a plantar ulcer, although four required foot surgery for ischemic feet. CONCLUSIONS: LCT is a simple, inexpensive, and noninvasive method of identifying the neuropathic foot at increased risk of ulceration. Patients with high plantar foot temperatures are at increased risk of neuropathic foot ulceration. A normal or low MFT in the neuropathic foot is a marker of PVD, which confers an increased risk of ischemic foot disease.

Blood Pressure↗

PubMedDate not supplied

Use of liquid crystal thermography in the evaluation of the diabetic foot.

Liquid crystal thermography (LCT) was used to determine temperature variations on the plantar surface of feet. The purpose was to identify thermal emission patterns associated with diabetic foot ulcers. Three population groups were screened: group I, 16 nondiabetic controls; group II, 21 diabetic patients with no history of pedal ulcers; and group III, 28 diabetic patients with active pedal ulceration or history of foot ulcerations. The results demonstrate a generalized increase in plantar foot temperature in group III compared with groups I and II. Temperature readings under metatarsal heads 1-5, great toe, heel, and lateral band were significantly increased (P less than .01) in group III. Additionally, the warm lateral surface displayed by group III patients was not significantly different in temperature from the medial arch of the foot. In groups I and II, the lateral band was significantly cooler (P less than .01) than the medial arch. In group III patients with active ulceration on only one foot, no significant difference in temperature was found between the foot with active ulceration compared with the contralateral nonulcerated foot. When patients with active pedal ulceration were compared with patients with a history of foot ulcers, no significant difference in temperature was seen at five of seven sites tested. A warm concentric color band surrounding active plantar ulcers was identified in group III. This pattern extended from the center of the ulcer to a distance of 8 mm. A significant change in temperature (P less than .01) was noted at 6- and 8-mm distances from the center of the ulcer. In addition, a mottled thermographic pattern was observed more frequently in group III patients than in groups I and II.(ABSTRACT TRUNCATED AT 250 WORDS)

Diabetic Angiopathies↗

PubMed1990

Medical thermography and its use in posttraumatic cephalagia.

The use of infrared thermographic imaging in the diagnosis of human illness is discussed from the point of view of its historical development and its multiple uses to the present time. Future goals for its use are outlined. Several case histories are presented documenting the use of thermography in post traumatic cephalalgia.

Adult↗

PubMed1989

Contact thermography in idiopathic trigeminal neuralgia and other facial pains.

Contact thermography is a useful tool in the differential diagnosis of facial pain and can be used to differentiate idiopathic trigeminal neuralgia from atypical facial pain and anaesthesia dolorosa. The increase in sympathetic activity found in idiopathic trigeminal neuralgia has not previously been reported. The basis for this finding is discussed.

Diagnosis, Differential↗

PubMed1996

Thermography of hands after a radial forearm flap has been raised.

To evaluate possible circulatory changes in the donor hand 18 patients underwent cold stress testing and thermography of both hands a mean of 13 months after a radial forearm flap had been harvested. Temperatures were measured with a computed Inframetrics 600L infrared thermocamera, and the images were videotaped at room temperature and after a cold challenge (immersion in a water bath at 15 degrees C for five minutes). Temperatures were measured on the volar aspect of each fingertip, and rewarming curves were plotted for both hands. The patients could be divided into three groups according to the rewarming pattern: mean temperature of the donor hand was more than 0.5 degree C warmer than that of the other hand (n = 7), rewarming was similar in both hands (n = 6), and the mean temperature of the donor hand was less than 0.5 degree C colder than that of the other hand (n = 5). Patients with a colder donor hand had significantly wider (Pearson's r = 0.62, p = 0.005) and longer (r = 0.71, p = 0.001) defects. The rewarming pattern did not correlate with subjective cold intolerance, but the temperature of the donor hand was a mean of 0.5 degree C less than that of the other hand in room temperature in subjects who experienced cold intolerance (p = 0.019). We conclude that the raising of a radial forearm flap, particularly a large one, affects the thermoregulatory system of the donor hand, results in abnormal rewarming, and can cause subjective cold intolerance.

Adult↗

PubMed1985

Evaluation by integrated thermography of the beneficial effect of cyclofenil in severe subcutaneous arterial insufficiency.

Integrated thermographic measurements were made in a patient suffering from a complex syndrome which included scleroderma, Osler-Weber-Rendu disease and a marked atherosclerotic circulatory insufficiency. A new anti-estrogenic drug, cyclofenil, elicited a rapid and prolonged curative effect against the entire syndrome. The circulatory amelioration was registered periodically by integrated thermography of the face and both hands. This method enables temperature distribution functions to be calculated and seems to hold considerable promise for the evaluation of circulatory changes and in particular those changes evoked by therapeutic agents.

Aged↗

PubMed1984

Thermography as a means for quantitative assessment of stump and phantom pains.

Exact differentiation into stump and phantom pain is required when pain is reported after amputation. In a majority of cases appropriate treatment can improve the pain. Thermography is simple and gives a good indication of the circulation in the stump without operative intervention. It provides a key to the nature of the pain in stump and phantom. Although typical patterns occur for pain in the stump or phantom, in this study the thermographic image could confirm the presence of phantom pain, but it could not rule out errors or false statements.

Adult↗

PubMed2005

Short communication: infrared thermography and visual examination of hooves of dairy cows in two stages of lactation.

Hooves of 16 lactating Holstein cows were examined twice for sole hemorrhages and underrun heels. Images of hooves were taken using infrared thermography to determine the temperatures of the coronary band and that of a control area above the coronary band. To adjust for skin (control) temperature, the difference (DeltaT) between the coronary band and the control area was calculated. Effects of stage of lactation, that is, 200 DIM, on temperature of the coronary band, DeltaT, and visual abnormalities were determined. Temperatures of the coronary bands of cows were greater for cows 200 DIM (6.1 +/- 0.8 vs. 3.3 +/- 0.9 degrees C). The DeltaT was greater for lateral claws than for medial claws (5.2 +/- 0.6 vs. 4.2 +/- 0.6 degrees C). Chi-square analysis revealed that the frequency of sole hemorrhages in hind lateral claws was significantly higher for cows 200 DIM. Increased temperatures of the coronary band and DeltaT in early/midlactation coincided with increased incidence of sole hemorrhages, but not to incidences of underrun heels. Because higher hoof temperatures occurred in cows <or=200 DIM compared with cows later in lactation, measurement of hoof temperatures among cows in early lactation may be useful in monitoring hoof health.

Animals↗

PubMed1975

Thermography in the management of carotid-cavernous fistulas.

The authors report their experiences with thermography as a new tool to assess the diagnosis and postoperative control of patients with carotid-cavernous fistulas (CCF). A zone of increased temperature on the homolateral orbital region is described in cases of CCF. A supraorbital "cool" area, as seen in patients with carotid stenosis or occlusion, is observed when surgery with the Jaeger-Hamby technique has been successful. Thermograms obtained in five patients are presented and the pathophysiology of these findings is discussed.

Adult↗

PubMed1987

The use of computerized thermography in the evaluation of non-traumatic anterior knee pain.

Computerized thermography was used to evaluate eight patients with the complaint of non-traumatic anterior knee pain. Computerized thermograms were recorded before and after subjects performed a specific rehabilitation program. Thermographic imaging was then repeated 4 weeks to 8 weeks after the initial thermogram. Among the subject group, thermal asymmetries were noted in the involved knees, but a specific abnormal thermal pattern could not be recognized. Changes in temperature and thermal patterns after exercise and over time were consistent within each subject, but were not consistent between subjects. Thermal asymmetries did not appear to resolve over time. It is felt that the pathology investigated by this study may involve many etiologies, therefore making it difficult to establish a single abnormal thermal pattern with regard to non-traumatic anterior knee pain.

Adolescent↗