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The core of Dynamic Angiothermography (DATG) its operating system is a plate featuring a very thin fine taut layer of a special plastic (18 x 24-cm diameter) incorporating liquid crystals. The molecular structure of the crystals enables them to refract ambient light in the red-to-violet spectrum depending on the heat detected by the plastic film when placed on the breast. The image this generates on the plate shows up as lines, a few millimeters in diameter, that represent key characteristics of the underlying blood flow. The proper interpretation of these signs results in the diagnosis. Dynamic Angiothermography, which is altogether different from any other thermographic technique, i.e. it does not measure heat but provides qualitative rather than quantitative data, has so far been tested on about more than 7400 patients with 33 years of follow up.

The plate

Physical characteristics

The DATG plate, unlike other plates that were until recently commercially available, is composed of a very fine sheet of plastic material (stretched over a slender, rigid stand) covered by a layer of black paint and another layer of liquid crystals. Its total thickness is no more than a few hundred microns. This design allows the plate to show a rapid response to skin heat, and equally rapidly return to the baseline appearance. When the plate is positioned on the skin or removed, the formation and disappearance of the image take place in under a second. Furthermore, when manufactured in this way, the plate is able to maintain a spatial resolution under 0.1 mm throughout the time required to interpret and photograph the images provided by the liquid crystals which, because of their peculiar molecular structure, refract part of the light in proportion to the heat received.

Image formation in DATG

The functional image
The fundamental difference between DATG and all the other 'thermographic' methods lies in the fact that the evaluation of the image is qualitative and not (as in other techniques) quantitative.
DATG does not contemplate any form of evaluation based on actual heat measurements. Instead, the diagnostic evaluation is based on the interpretation of the underlying blood circulation, which varies within the breast or within zones of the same breast as a result of various physiopathological conditions. These functional circulatory variations are therefore functionally recorded by DATG (hence the term 'dynamic' Angiothermography).

Characteristics of the DATG image

Over the years, I have been able to test and reach firm conclusions regarding the three key points of DATG semiotics.
1. Each woman possesses her own exclusively personal pattern, rather like a fingerprint.
2. In the absence of the onset of a significant pathology, this pattern remains identical over many years until, in the post-menopausal period, the lines weaken and progressively tend to disappear. Other physiological variations in the intensity of the pattern, caused by pregnancy and breastfeeding, are transitory and rapidly regress.
3. In the presence of an epithelial pathology, whether "preneoplastic" and/or preinvasive or invasive, the pattern abnormalities do not reflect in any way the shape or size of the lesion; thus, a large tumor can be fed by a small flow line, or vice versa.
These three characteristics are fully in keeping with the functional nature of the DATG examination.
1. The observation that each woman has her own normal personal pattern is in line with the vast anatomical variety of the vascular bed that distinguishes one person from another; this variety also regards the correspondence of physiopathological manifestations and their localization. This leads to a picture which is never the same as that of another person.. On reflection, it also appears highly unlikely that one will ever find one x-ray mammography (XRM) image that is exactly identical to that of another person's. This helps explain the great difficulty encountered by thermographers in drawing up a classification of thermal patterns.
2. Endothelial cell replication is known to be very slow (e.g. 50 times slower than colon cell turnover). It is therefore not surprising that vascularisation should remain constant except in the presence of wounding or angiogenesis. This stability is confirmed by the constancy of the DATG pattern, which remains basically unchanged throughout the genital period. From the clinical standpoint, this constancy is very useful in that every true alteration of the functional circulation corresponds to an underlying pathological cause requiring interpretation.
3. Unlike with other diagnostic methods, with DATG a tumor does not have to reach any particular size before it can be detected. This is due to the fact that the requirement for supplementary blood circulation begins in the earliest phases of carcinogenesis, a factor that explains why biopsies performed on indication of DATG often reveal Atypia and in situ carcinomas, especially lobular ones (outnumbering ductal ones by 2:1, in contrast to reports based on indications from XRM). On clinical grounds, this factor allows diagnosis of in situ carcinomas, micro invasive tumors, and in general of very small neoplasms.

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