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1.
Radiography (Lond) ; 30(4): 1144-1150, 2024 Jul.
Article in English | MEDLINE | ID: mdl-38824873

ABSTRACT

INTRODUCTION: The implications of shorter scan time and lower tube voltage in the dual-source CT coronary angiography (CTCA) scan protocol necessitate the adaptation of contrast media (CM) injection parameters. This audit evaluates the coronary arteries' vascular attenuation and image quality by comparing the personalised patient protocol technology (P3T) contrast injection software with standard injection protocol. The secondary aim is to determine the relationship between CM volume and the patient's weight. METHODOLOGY: A Siemens Somatom Definition Force CT Unit was used to scan 30 sets of patients between August 2020 and October 2020. Patients were selected retrospectively and separated into Standard Injection and P3T injection protocols. An experienced radiologist blinded to the groups reviewed the coronary vessels' contrast enhancement and image quality. RESULTS: Overall, the mean HU of all the main coronary artery vessels obtained from P3T injection software reached above 350 HU and was diagnostically sufficient. The mean attenuation at the proximal region of RCA in the 80-99 kg weight category was significantly higher in the P3T injection software than the standard injection protocol (p < 0.001). The CM volume proposed by P3T injection software for 40-59 kg was approximately 57 ± 5 mls, while 75 ml was used for the standard injection protocol. CONCLUSION: P3T injection software in CTCA resulted in an adequate diagnostic attenuation of coronary arteries (>350HU) in all weight groups, most effectively in the higher weight group, while maintaining diagnostic image quality. Further, the P3T software reduces CM volumes in lower-weight patients. IMPLICATIONS: P3T software enables reducing CM volume in lower-weight patients while improving vascular enhancement in CTCA scans in higher-weight patients.


Subject(s)
Computed Tomography Angiography , Contrast Media , Coronary Angiography , Software , Humans , Contrast Media/administration & dosage , Computed Tomography Angiography/methods , Coronary Angiography/methods , Male , Female , Retrospective Studies , Middle Aged , Aged , Clinical Audit , Coronary Artery Disease/diagnostic imaging
2.
Singapore Dent J ; 24(1): 29-34, 2001 Jun.
Article in English | MEDLINE | ID: mdl-11699350

ABSTRACT

A case report of an 11-year-old Caucasian female who presented with a Class II div I anterior open bite malocclusion. Overjet is 6 mm and the anterior open bite 2 mm. There was a history of digit sucking till she was eight years old. She was successfully treated by non-extraction with pre-adjusted Edgewise appliances and high-pull headgear for a period of 27 months.


Subject(s)
Malocclusion, Angle Class II/therapy , Open Bite/therapy , Orthodontics, Corrective/methods , Cephalometry , Child , Extraoral Traction Appliances , Female , Fingersucking/adverse effects , Humans , Open Bite/etiology , Orthodontics, Corrective/instrumentation
3.
Singapore Dent J ; 24(1): 35-42, 2001 Jun.
Article in English | MEDLINE | ID: mdl-11699351

ABSTRACT

Case report of an adult Caucasian female aged 23 years and nine months who complained of some difficulty in chewing and talking. Patient was diagnosed to have a mild Class III skeletal malocclusion with an anterior open bite of 4 mm. Treatment included combined orthodontic and orthognathic surgical approach. Surgery included surgically assisted maxillary expansion, advancement and impaction, a mandibular setback and a vertical, antero-posterior reduction genioplasty. The present case report illustrates a coordinated orthodontic and orthognathic surgical approach in the treatment of skeletal open bite deformities.


Subject(s)
Malocclusion, Angle Class III/therapy , Open Bite/therapy , Orthognathic Surgical Procedures , Adult , Female , Humans , Malocclusion, Angle Class III/surgery , Open Bite/surgery , Osteotomy, Le Fort , Palatal Expansion Technique
4.
Angle Orthod ; 71(2): 90-102, 2001 Apr.
Article in English | MEDLINE | ID: mdl-11302594

ABSTRACT

The purpose of this study was to examine dimensional changes in the maxillary arch following the extractions of maxillary first or second premolars. Pre- and posttreatment records of 71 patients treated by one experienced orthodontist were randomly selected from completed premolar extraction cases. Forty-five patients involved the extraction of maxillary first premolars; of these, 15 also had extractions of mandibular first premolars and 30 had extractions of mandibular second premolars. Twenty-six patients involved the extraction of maxillary second premolars, and all of these also had extractions of mandibular second premolars. Pretreatment factors that seemed to suggest a basis for the extraction choice in this sample included incisal overjet, molar relationship, and maxillary incisor protrusion. Mean reductions with treatment in the anteroposterior arch dimension were similar within all premolar extraction groups. There was evidence of greater mean maxillary intermolar-width reduction following the extractions of maxillary second premolars than following extractions of maxillary first premolars. Greater mean maxillary incisor retraction was found in the maxillary first premolar extraction group than in the maxillary second premolar group. A wide range of individual variation in incisor and molar changes did, however, accompany treatment involving both maxillary premolar extraction sequences.


Subject(s)
Bicuspid/surgery , Cephalometry , Dental Occlusion , Maxilla/pathology , Serial Extraction , Adolescent , Analysis of Variance , Confidence Intervals , Dental Arch/pathology , Female , Follow-Up Studies , Humans , Incisor/pathology , Male , Malocclusion/pathology , Malocclusion/therapy , Mandible , Molar/pathology , Statistics as Topic , Tooth Movement Techniques
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