MSCT AN INTRODUCTION TO A NOVEL TECHNIQUE Dr. Hazem Abu Zeid Yousef Lecturer of Radiodiagnosis Faculty of Medicine Assiut University
Jul 30, 2015
MSCT AN INTRODUCTION TO A NOVEL TECHNIQUE
Dr. Hazem Abu Zeid YousefLecturer of Radiodiagnosis
Faculty of MedicineAssiut University
INTRODUCTION
The introduction of spiral CT in the early 1990s resulted in fundamental and far-reaching improvement of CT imaging.
For the first time volume data could be acquired without mis-registration of anatomical details, which initiated the development of 3D image processing techniques such as multi-planar reformations (MPRs), maximum intensity projections (MIPs), surface-shaded displays (SSDs) or volume renderings.
As an important application CT angiography (CTA) has been established in clinical practice. As a consequence of increasing clinical demands, single-slice spiral CT with 1-s gantry rotation time soon encountered its limitations.
Larger volume coverage and improved transverse resolution can be achieved by simultaneous acquisition of more than one slice and by a shorter gantry rotation time. The first step towards multi-slice acquisition was a two-slice CT scanner introduced
in 1993 (Elscint Twin). In 1998 all major CT manufacturers introduced multi-slice CT systems which brought about considerable improvements of scan speed, transverse resolution and utilization of the
tube output.
CASE (1)
NON ENHANCED CT SHOWING BILATERAL RENAL PELVIS CALCULI WITH MARKED PYELITIS.
ENHANCED CT SHOWING GOOD ENHANCEMENT.
CASE (2)
THICK SLAP MIPBILATERAL RENAL AND UB STONES
CORONAL IMAGESSHOWING MARKED PYELITIS OF THE LEFT KIDNEY
CASE (4)
CURVED REFORMATLOWER URETERIC STONE
CAUSING MILD HYDRONEPHROSIS
DOUBLE DENSITY VR IMAGETHE STONE IS DEMONSTRATED
AGAINST THE UNDERLYINGBONE
CASE (2)
OBSTRUCTED INFECTED KIDNEYENLARGED LEFT KIDNEY WITH MARKED STRANDING OF THE
PERINEPHRIC FAT AND OBSTRUCTING PELVIC CALCULUS
BOSNIOAK TYPE II CYST WITH THIN CALCIFIED RIM AND INTRACYSTIC SEPTUM
(THANKS FOR THE SUBMILLEMETRIC SLICE THICKNESS)
MALIGNANT LOWER POLAR LEFT RENAL MASS WITH ENHANCING MALIGNANT THROMBUS WITHIN THE IVC
AND SECONDARY VARICOSITIES OF THE LEFT TESTICULAR VEIN.
URETERS
AS A RULE;MALIGNANT URETERIC NEOPLASMS CHARACTERISTICALLY CAUSE DILATATION OF THE URETER BOTH PROXIMAL AND DISTAL TO THE LESION.