ملخص بحث درجة البكالريوس

English Abstract
High Resolution Computed Tomography of the Interstitial Lung

Diseases (HRCT)

"A Comparison Study between Sequential Technique and Spiral

Technique in Multi-Detector Computed Tomography"

Wareed H. AL-Enaini, BSc. (thesis conductor)

Dr. Ataher Radwi, consultant (thesis supervisor)

Mr. Nabeel Mishah, RT – BSc\CT-MRI, DHM.,MBA (thesis supervisor)

Background: High Resolution CT or HRCT of the lung is a medical diagnostic test used for

diagnosis and assessment of many lung diseases such as interstitial lung disease.

the test is conventionally performed by taking thin sections 1 mm and 8-10 mm apart(sequential technique).

The result is a few images which should be representative of the lungs in general,
but whichcover only approximately one third of the lungs.

Modern MDCT scanners are able to replace the old using of sequential technique, and are

capable of imaging at full resolution yet retain very fast coverage - images can then be

reconstructed retrospectively from the volumetric raw data.

Method: six casesagreed to participate in this study where they all share the same clinical

indication to undergo HRCT for interstitial lung disease in Computed Tomographydepartment.

for each patient both CT techniques were performed (HRCT sequential technique and HRCT

spiral technique) by using 64 MSCT SOMATOM, Siemens machine available at King AbdulAziz University Hospital - Jeddah, SA.

The images produced were independently evaluated on PACS workstations by two qualified

chest radiologists with a good experience in interpreting HRCT. Dr.Ataher Radwi, consultant

Cardiothoracic Radiologist-RSSA president, and Dr. Adel Kotb, senior registar radiologist.

Both radiologists were subsequently asked to fill the specially designed evaluation form twice

in order to evaluate the images generated by each technique regarding to image details,

quality, accuracy, and artifact in different two HRCT techniques.

A qualitative judgment between the sequential HRCT and spiral HRCT were scored by scale

from 0 as worst and 5 for Excellent.

Result: From the data collected and after the analysis we found that HRCT image details and

accuracy was much better in spiral technique, while image resolution was much better in

sequential technique and in term of image quality, it was found to be equal in both techniques

The percentage of Artifact free images was found to be more in sequential technique

compared to spiral technique.

Scanning time duration was significantly reduced in spiral technique but the estimated

radiation dose was much higher compared to sequential technique.

Keywords: HRCT, CT, interstitial lung diseases, MDCT, spiral, sequential, , image quality,