High resolution digitized image analysis of chest x-rays for diagnosis of difficult to visualize evolving very ealrly stage lung cancer, pnumoconiosis and pulmonary diseases

• US 20020094119A1
• Filed: 01/18/2001
• Published: 07/18/2002
• Est. Priority Date: 01/18/2001
• Status: Abandoned Application

• Current Assignee: Velayudhan Sahadevan
• Original Assignee: Velayudhan Sahadevan
• Inventors: Sahadevan, Velayudhan
• Application Number:
  US09/766,124
• Publication Number:
  US 20020094119A1
• Time in Patent Office: Days
• US Class Current: 382/132
• CPC Class Codes: G06T 7/0012 Biomedical image inspection
• CPC Class Codes: G16H 30/40 for processing medical images, e.g. editing

Abstract

A method and a system for high, super- and ultra-high resolution digitized image analysis of chest x-rays is provided for diagnosis of slowly evolving difficult to visualize early stage lung cancer and pulmonary diseases including very early stage diffuse pulmonary pneumoconiosis and silicosis. This method of digitized chest x-ray image analysis also facilitates the visualization of visceral, mediastinal and parietal pleura and the pericardium as separate distinct layers covering the lung and the heart. Such distinct imaging of those structures was not feasible by any other methods of imaging of the chest. Digital image enhancements allow presentation of important structures in the image in different colors and contrast. This method of high resolution digitized and software assisted chest x-ray analysis shows that it takes about 3-4 years before a lung cancer becomes distinctly visible in a chest x-ray. Chest x-ray is the most commonly used initial diagnostic imaging for the diagnosis of pulmonary diseases. Furthermore, it is a very cost-effective means for screening for early stage lung cancer and pulmonary diseases such as the pulmonary pneumoconiosis. This method of image analysis is facilitated by digitized image capture with high, super high and ultra-high resolution digital camera (28, 30, 32, 54, 64, 66) with very small pixels, image processing algorithms, a computer (138), a server (96) and printer (108) systems.

Claims

1. A method for cost efficient high, super-high and ultra-high resolution digitized image analysis of chest x-rays with image processing algorithms for diagnosis of slowly evolving lung cancer and pulmonary diseases that are invisible or difficult to see in routine chest x-rays.

2. A method for cost efficient high, super-high and ultra-high resolution digitized image analysis of chest x-rays of claim 1 for diagnosis of slowly evolving lung cancer and pulmonary diseases that are invisible or difficult to see in routine chest x-rays, with a system comprising of:

(a) image digitizing means comprising of high, super high and ultra-high resolution digital cameras for digitized image acquisition,

(b) image processing means as image processing algorithms,

(c) image storage means as a computer'"'"'s fixed or removable hard disc, or external hard disc,

(d) means for digital networking,

(e) means for image display onto computer monitors and as print or image display onto screens by means of LCD projectors,

(f) means for such processed image printing

3. A method of cost-efficient image analysis according to claim 1 for the detection of invisible very small evolving lung cancer in chest x-rays by suppression of contrast interference by high and super high resolution digitized and software assisted image analysis.

4. A cost-efficient system according to claim 1 for assessment of the extent of tumor growth including the biologically active latent tumor that is present in the screen film chest x-ray but it is invisible due to contrast interference and to make it visible by close up digitized image capture and color, brightness and contrast adjustments.

5. A cost-efficient system according to claim 1 for assessment of the extent of tumor growth including the biologically active latent tumor that are present in the screen film chest x-ray but it is invisible due to contrast interference and to make them visible by digitized image analysis.

6. A method of claim 1 for evaluating diagnostically important image data contained in a chest x-ray by improved high resolution digitized image analysis by image capture at high bit depth including at 12-bit, 16 bit, 24 bit and 48 bit with high, super-high and ultra-high resolution CCD digital cameras and image processing algorithms and displaying of such processed image on computer monitors or its projection onto screens by means of electronic LCD projectors or to print them onto hard mediums at higher dpi for improved recognition of normal and abnormal structures and thereby improved diagnosis of lung cancer and pulmonary disease by skilled diagnostic experts.

7. A method of claim 1 to use different window levels to standardize the optical density of the digitized chest x-ray to compensate the differences in optical density of screen film chest x-rays due to wide range of exposures used in image acquisition, patient'"'"'s sizes, differences in tissue composition of the chest and lung tissue and chemical processing of screen film radiographs to show conspicuousness of a lesion and to make it easier to see.

8. A method of evaluating diagnostically important image data contained in a chest x-ray of claim 1 by sizing and orientation, copy and paste, palette and pixel analysis, convolution, edge detection and modification, pixel and pair arithmetic, binning, contrast modification, histogram analysis, morphology and histogram measurements for improved diagnosis of lung diseases including lung cancer and pulmonary diseases by skilled diagnostic experts.

9. A method of claim 1 wherein said evaluation of screen-film chest x-rays to facilitate the practical utilization of the theoretical spatial resolution of the film used in screen-film chest x-rays by its digitized and contrast enhanced image analysis with modern larger CCD and super CCD digital cameras and contrast enhancement with image processing algorithms for the detection of smaller than the tumor masses that can be detected in a routine chest x-ray and thereby to improve the diagnostic sensitivity of screen film chest x-ray for improved detection of evolving early stage lung cancer and pulmonary diseases.

10. A method of evaluating diagnostically important image data contained in a chest x-ray by improved high resolution digitized image analysis of claim 1 by storing such processed image onto individual removable hard discs that are designated for each patients imaging medical history and its recall and display onto monitors for side by side analysis with recent such processed chest x-rays for improved diagnosis of lung cancer and pulmonary diseases.

11. A method of claim 1 wherein said evaluation of digitized and software assisted image analysis of chest x-rays for a second reading to improve the diagnostic sensitivity and classification of benign and malignant diseases of the lung.

12. A method of claim 1 wherein said evaluation of digitized and software assisted image analysis of chest x-rays for a second reading to improve the diagnosis of lung cancer hidden behind the cardiac shadow which are difficult to detect from the routine chest x-rays.

13. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images as a second reading to facilitate improved detection and differential diagnosis of gradually increasing small densities with irregular boarders or bilobulated small masses as probable lung cancer.

14. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images to facilitate improved detection and diagnosis of proliferative pulmonary diseases including the malignant proliferative disorders.

15. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images to facilitate improved detection and differential diagnosis of tumor with groups of distorted bronchi, hypervascularity, and distorted parenchyma.

16. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images for improved detection and differential diagnosis of the thickened bronchus and bronchiolar diseases.

17. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images for improved detection and differential diagnosis of asymmetric pulmonary segmental densities, focal or segmental lung tissue retraction and atelectasis as signs of evolving pulmonary diseases including lung cancer.

18. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images for detection of neoangiogenesis in evolving early stage lung cancer.

19. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images for improved visualization of convergent blood vessels to pulmonary mass as a sign of angiogenesis associated with lung cancer and its differentiation from benign causes of angiogenesis in the absence of a positive history for acute lung injuries such as surgical wounds, trauma, infection and or abscess.

20. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images to improve the detection of the hilar and mediastinal lymph nodes and its differential diagnosis of enlarged lymph nodes associated with malignant diseases like lung cancer and nonmalignant diseases like sarcoidosis.

21. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images to improve its diagnostic sensitivity for the detection of early evolving silicosis and coal worker'"'"'s pneumoconiosis.

22. A method of claim 1 wherein said evaluation of high resolution digitized and software assisted chest x-ray images to assist the improved detection of early evolving silicosis and coal worker'"'"'s pneumoconiosis and its differential diagnosis from pulmonary interstitial diseases like sarcoidosis.

23. A method of claim 1 wherein said evaluation of digitized and software assisted image analysis of chest x-rays as a means for distinct visualization of layers of visceral, mediastinal and parietal pleura and pericardium.

24. A method of claim 1 wherein said evaluation of digitized and software assisted image analysis of chest x-rays as a means for distinct visualization of diseases affecting the visceral, mediastinal and parietal pleura and pericardium.