ABSTRACT
I. Introduction 397
II. Definitions 398
A. Lung Density 398
B. Lung Volumes 400
C. Lung Water and Blood Volume Measurements 402
D. Lung Ventilation and Perfusion 403
E. PA Pressures and Right Ventricular Function 405
F. Diffusion 409
III. Conclusion 410
References 411
I. Introduction
Every day, clinicians use imaging to diagnose disease and to assist in therapeutic
decision-making. The value of anatomic imaging of lung structure with X-ray
computed tomography (CT) is well known to every clinician. Advances in
molecular imaging that may eventually be used to guide gene therapy or to evalu-
ate biologic processes in vivo at the cellular and even subcellular levels hold
great promise. Recent improvements in instrumentation are making it possible
to combine different types of measurements into single multimodality imaging
sessions (see Chapter 7).
