251. Quantitative Estimation of CBF Image by Triangular SPECT System

Development and Evaluation of Image Reconstruction Algorithms for a Novel Desktop SPECT System

Objective (s): Various iterative reconstruction algorithms in nuclear medicine have been introduced in the last three decades. For each new imaging system, it is wise to select appropriate image reconstruction algorithms and evaluate their performance. In this study, three approaches of image reconstruction were developed for a novel desktop open-gantry SPECT system, PERSPECT, to assess their p...

What is the meaning of quantitative CBF?

Comparison of CBF measurement by ASL and SPECT in Patients with Internal Carotid Artery Stenosis

INTRODUCTION: Hemodynamic assessment of patients who have steno-occlusive cerebrovasucular disease plays an important role for decision making and planning of surgical interventions. In this field, SPECT is currently the modality of choice, but faster and less invasive techniques are highly desirable. Arterial spin labeling (ASL) is emerging as clinically promising technique for non-invasive pe...

Image compression by B-tree triangular coding

This paper describes an algorithm for still image compression called B-tree triangular coding (BTTC). The coding scheme is based on the recursive decomposition of the image domain into right-angled triangles arranged in a binary tree. The method is attractive because of its fast encoding, O(n logn), and decoding, (n), where n is the number of pixels, and because it is easy to implement and to p...

Monitoring CBF in clinical routine by dynamic single photon emission tomography (SPECT) of inhaled xenon-133.

A very simple and low-cost brain dedicated, rapidly rotating Single Photon Emission Tomograph SPECT is described. Its use in following patients with ischemic stroke is illustrated by two middle cerebral artery occlusion cases, one with persistent occlusion and low CBF in MCA territory, and one with early lysis of the occlusion having high CBF (massive luxury perfusion) for some weeks. Evidence ...