SA Journal of Radiology - Volume 12, Issue 2, 2008
Volume 12, Issue 2, 2008
Author Jan LotzSource: SA Journal of Radiology 12 (2008)More Less
I was hoping to publish an editorial by a renowned overseas expert in the field of PET-CT; this has not been possible but I hope it will appear in the next issue of the SAJR.
Developments around PET-CT are of critical importance to state-of-the-art medicine in this country. I experience a feeling of déjà vu when I hear that South Africa cannot afford technology of this nature.
Source: SA Journal of Radiology 12, pp 28 –31 (2008)More Less
Background. Studies indicate that computed radiography (CR) can lead to increased radiation dose to patients. It is therefore important to relate the exposure indicators provided by CR manufacturers to the radiation dose delivered so as to assess the radiation dose delivered to patients directly from the exposure indicators.
Aim. The aim of this study was to investigate the performance of a Agfa CR system in order to characterise the dose indicators provided by the system.
Method. The imaging plate response was characterised in terms of entrance exposure to the plate and the digital signal indicators generated by the system (SAL - scanning average level; and lgM - logarithmic median) for different beam qualities. Several exposures were performed on a mammography unit, and the digital signal, expressed in terms of SAL and lgM for each image, was correlated with the entrance exposure on a standard American College of Radiology (ACR) phantom. From this correlation, a relationship between the Agfa dose indices (SAL and lgM) and the average glandular dose (AGD) in mammography could be established. An equation was derived to calculate the AGD delivered to the patient as a function of the exposure indicator, lgM, and the kV.
Results. The results indicated that the measured AGD at 28 kV for a standard breast thickness during routine calibration with the ACR phantom was 1.58 mGy (lgM=1.99). This dose value lay within 1.5% of the value calculated using the derived equation for a standard Perspex thickness of 4.2 cm using the automatic exposure control (AEC) (1.56 mGy). The standard error in using this equation was calculated to be 8.3%.
Source: SA Journal of Radiology 12, pp 32 –34 (2008)More Less
Endovascular stent graft repair for the treatment of post-traumatic aortic rupture is emerging as a safe, minimally invasive and attractive alternative to surgery. This report covers the importance of computer tomographic (CT) angiography as a non-invasive imaging modality in the diagnoses of post-traumatic aortic rupture and the role of CT in pre-endovascular stent work-up. A detailed discussion on the endovascular procedure including the major limitations to stent insertion follows, and a comparison of endovascular stent graft versus surgery.
Source: SA Journal of Radiology 12, pp 36 –37 (2008)More Less
Protein-losing enteropathy (PLE) is defined as a condition in which excess protein loss into the gastrointestinal lumen is severe enough to produce hypoproteinaemia. Previously reported procedures for the detection of protein loss have many limitations (such as rapid reabsorption of the radiolabel, unstable protein binding both in vivo and in vitro, and limited availability) and were, moreover, cumbersome as well as unpleasant, as they involved 24-hour urine and stool collection. The study was also prone to error owing to the long urine and stool collection period.
Source: SA Journal of Radiology 12, pp 38 –40 (2008)More Less
Conn's syndrome is a rare condition among hypertensive patients; imaging of the aldosterone-producing adenoma (APA) can prove challenging but is nonetheless very important for surgical planning and cure. We present two patients with MRI (magnetic resonance imaging) confirmation of APA with negative and equivocal CT (computed tomography) scans.
Author Logeshini NaidooSource: SA Journal of Radiology 12, pp 42 –44 (2008)More Less
Meconium peritonitis results from intrauterine gastrointestinal perforation, and can occur as early as the second trimester. Meconium extrudes into the peritoneal cavity, inciting an intense fibroplastic reaction that results in intra-abdominal calcifications. It is a rare condition occurring in 1 in 35 000 pregnant women.
Source: SA Journal of Radiology 12, pp 46 –49 (2008)More Less
Temporal bone fractures and their acute complications have been well described in radiology and ENT journals; this is in contrast to the delayed and rare complication of implantation cholesteatomas. We present the computed tomographic (CT) findings of two cases of infiltrating cholesteatomas that developed many years after temporal bone trauma.
Source: SA Journal of Radiology 12, pp 50 –53 (2008)More Less
Magnetic resonance imaging (MRI) is widely used as a non-invasive imaging modality for a wide variety of diseases and disorders. A patient placed in the MR machine for scanning is subjected to a powerful static magnetic field, rapidly varying gradient magnetic field, and radiofrequency field - in addition to the risk factors associated with gadolinium-based MR contrast agents. At present, there is no conclusive evidence for adverse biological effects in patients undergoing MRI. However, a clear understanding of the various bioeffects associated with MRI diagnostics is necessary to ensure the safety of patients as well as to justify its clinical use.
Source: SA Journal of Radiology 12 (2008)More Less
Long recognised as the standard two volume reference work on the scientific basis and clinical practice of radiology, the new edition of Textbook of Radiology and Imaging has been thoroughly revised and up-dated in order to incorporate the latest technologies and modalities in the field.
Source: SA Journal of Radiology 12, pp 54 –55 (2008)More Less
Refresher course (product of the Education Committee)
Gold medal awards
Paediatric imaging workshop
Examination report (12-14 May 2008)
Forthcoming congresses / workshops
Radiological Society of North America (RSNA)
RSSA Travel Award
University think tank
University publication report 2007 and 2008 to date
CUBIC (Cross Universities Brain Imaging Centre (3T MRI facility)
Source: SA Journal of Radiology 12 (2008)More Less
1. CPD questionnaires must be completed online via www.cpdjournals.org.za. After submission, you can check the answers and print your certificate. Questions may be answered up to 6 months after publication of each issue.
2. Read the articles in the journal to find the answers to the questions.
3. Go to www.cpdjournals.org.za to answer the questions.