scholarly journals Availability and Quality of Computed Tomography and Magnetic Resonance Imaging Equipment in U.S. Emergency Departments

2008 ◽  
Vol 15 (8) ◽  
pp. 780-783 ◽  
Author(s):  
Adit A. Ginde ◽  
Anthony Foianini ◽  
Daniel M. Renner ◽  
Morgan Valley ◽  
Carlos A. Camargo, Jr
2016 ◽  
Vol 49 (3) ◽  
pp. 158-164
Author(s):  
Tiago da Silva Jornada ◽  
Camila Hitomi Murata ◽  
Regina Bitelli Medeiros

Abstract Objective: To study the influence that the scan percentage tool used in partial k-space acquisition has on the quality of images obtained with magnetic resonance imaging equipment. Materials and Methods: A Philips 1.5 T magnetic resonance imaging scanner was used in order to obtain phantom images for quality control tests and images of the knee of an adult male. Results: There were no significant variations in the uniformity and signal-to-noise ratios with the phantom images. However, analysis of the high-contrast spatial resolution revealed significant degradation when scan percentages of 70% and 85% were used in the acquisition of T1- and T2-weighted images, respectively. There was significant degradation when a scan percentage of 25% was used in T1- and T2-weighted in vivo images (p ≤ 0.01 for both). Conclusion: The use of tools that limit the k-space is not recommended without knowledge of their effect on image quality.


2016 ◽  
Vol 22 (4) ◽  
pp. 93-96 ◽  
Author(s):  
Osamu Tanaka ◽  
Takayoshi Iida ◽  
Hisao Komeda ◽  
Masayoshi Tamaki ◽  
Kensaku Seike ◽  
...  

Abstract Visualization of markers is critical for imaging modalities such as computed tomography (CT) and magnetic resonance imaging (MRI). However, the size of the marker varies according to the imaging technique. While a large-sized marker is more useful for visualization in MRI, it results in artifacts on CT and causes substantial pain on administration. In contrast, a small-sized marker reduces the artifacts on CT but hampers MRI detection. Herein, we report a new ironcontaining marker and compare its utility with that of non-iron-containing markers. Five patients underwent CT/MRI fusion-based intensity-modulated radiotherapy, and the markers were placed by urologists. A Gold Anchor™ (GA; diameter, 0.28 mm; length, 10 mm) was placed using a 22G needle on the right side of the prostate. A VISICOIL™ (VIS; diameter, 0.35 mm; length, 10 mm) was placed using a 19G needle on the left side. MRI was performed using T2*-weighted imaging. Three observers evaluated and scored the visual qualities of the acquired images. The mean score of visualization was almost identical between the GA and VIS in radiography and cone-beam CT (Novalis Tx). The artifacts in planning CT were slightly larger using the GA than using the VIS. The visualization of the marker on MRI using the GA was superior to that using the VIS. In conclusion, the visualization quality of radiography, conebeam CT, and planning CT was roughly equal between the GA and VIS. However, the GA was more strongly visualized than was the VIS on MRI due to iron containing.


2020 ◽  
Vol 50 (2) ◽  
pp. 100
Author(s):  
Asma Abdullah ◽  
Yii Hern E ◽  
Norsyamimi AR ◽  
Kirubananthini J ◽  
Roslenda AR ◽  
...  

ABSTRACTBackground: Tinnitus is believed to cause significant psychological distress leading to impairment in quality of life (QOL). Purpose: To assess the negative impact of tinnitus on patient’s QOL and discuss the management approach of tinnitus patient. Method: A cross-sectional study was conducted within one year duration on 88 patients who experienced tinnitus. Patients from Otorhinolaryngology clinic, Universiti Kebangsaan Malaysia Medical Centre (UKMMC) were evaluated based on socio-demographic data, clinical data and QOL. QOL was assessed using Tinnitus Handicap Inventory (THI), a self-report questionnaire measuring 3 domains of QOL: functional, emotional and catastrophic scales. Result: Respondents consisted of 35 males (39.8%) and 53 females (60.2%), with mean age of 57.9±13.9 years old. Pure tone audiometry should be done at least once during the follow up period. Patients with persistent tinnitus had significantly higher mean THI total scores (p=0.042) and emotional subscale score (p=0.037) compared to patients with intermittent tinnitus. However, there were no significant associations between gender, duration of tinnitus and laterality of tinnitus with patient’s THI score. Discussion: All patients should have good history taking, proper physical examination and investigation. Those without the primary cause of tinnitus would be given tinnitus activity treatment by good counselling on tinnitus. Patient with vascular disorder would be given conservative treatment. Conclusion: Magnetic resonance imaging was indicated in asymmetrical hearing loss with tinnitus. Computed tomography scan with contrast was indicated when there is pulsatile tinnitus with/without abnormal ear finding. Patients with high grades THI questionnaire would be referred to psychiatrist for further assessment. ABSTRAKLatar belakang: Tinitus diyakini dapat menyebabkan stress psikologi yang signifikan sehingga mengakibatkan penurunan kualitas hidup seseorang (Quality of Life / QOL). Tujuan: Menilai dampak negatif tinitus pada kualitas hidup penderita dan merencanakan penatalaksanaannya. Metode: Penelitian ini merupakan studi potong lintang pada 88 penderita tinitus selama satu tahun. Penderita yang datang ke unit rawat jalan Telinga Hidung Tenggorok Bedah Kepala dan Leher (THT-KL), Universiti Kebangsaan Malaysia Medical Centre (UKMMC) dilakukan evaluasi berdasarkan data demografi, data klinis dan QOL. Quality of life dinilai menggunakan Tinnitus Handicap Inventory (THI), kuesioner tentang penderita yang mengukur 3 domain QOL: skala fungsional, emosional dan katastropik. Hasil: Responden terdiri dari 35 laki-laki (39,8%) dan 53 perempuan (60,2%), dengan rerata usia 57.9±13.9 tahun. Audiometri nada murni perlu dilakukan minimal satu kali selama periode penelitian. Penderita dengan tinitus persisten secara signifikan memiliki nilai rata-rata THI yang lebih tinggi (p=0.042) dan nilai emotional subscale (p=0.037) dibandingkan dengan penderita tinitus intermiten. Tidak ada hubungan yang signifikan antara jenis kelamin, durasi tinitus dan lateralisasi tinitus dengan nilai THI penderita. Diskusi: Semua penderita diperlukan anamnesis yang baik dan pemeriksaan fisik yang menyeluruh. Penderita tanpa penyebab primer dari tinitusnya akan diberikan terapi konseling tinitus yang baik. Penderita dengan gangguan pembuluh darah akan diberikan pengobatan konservatif. Kesimpulan: Magnetic resonance imaging perlu dilakukan pada gangguan pendengaran satu sisi dengan tinitus. Computed tomography scan dengan kontras dilakukan pada tinitus pulsatil dengan atau tanpa kelainan pada telinga. Pada pendertita dengan nilai kuesioner THI yang tinggi akan dirujuk ke psikiater untuk penilaian lebih lanjut.


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