Effect of removing image pixel noise bits on the detection of simulated lung nodules

Keh-Shih Chuang; A. Sankaran

doi:10.1117/12.59444

1 June 1992 Effect of removing image pixel noise bits on the detection of simulated lung nodules

Keh-Shih Chuang, A. Sankaran

Proceedings Volume 1652, Medical Imaging VI: Image Processing; (1992) https://doi.org/10.1117/12.59444
Event: Medical Imaging VI, 1992, Newport Beach, CA, United States

Abstract

Our previous studies used statistical methods to assess the noise level in digital images of various radiological modalities. We separated the pixel data into signal bits and noise bits and demonstrated visually that the removal of the noise bits will not affect the image quality. In this paper we report our further study and demonstrate quantitatively that the removal of noise bits has no effect on the image property. The detectability of simulated lung nodules on a wedge phantom is used as a basis for this study. The test phantom consists of a Lucite step wedge of 22 steps (12.5 mm/step) with nylon spheres (1/4 inch, 3/8 inch, and 1/2 inch diameter) simulating nodules kept at each step. Test images of the phantom were taken on a scanning equalization radiographic system which has better nodule detectability than conventional diagnostic x ray systems. The gray-levels at each step of the wedge on the nodule with respect to the background were measured and plotted against the thickness of the wedge. Preliminary results show that the removal of the noise bits do not affect the shape of the curve and thus the detectability of the nodule.

Citation Download Citation

Keh-Shih Chuang and A. Sankaran "Effect of removing image pixel noise bits on the detection of simulated lung nodules", Proc. SPIE 1652, Medical Imaging VI: Image Processing, (1 June 1992); https://doi.org/10.1117/12.59444

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available