Tomoaki Sasaki
RMIT University
Posterior segment of eyeballInternal medicineRadiologySurgeryPathologyMagnetic resonance imagingCardiologyLymphatic systemLungParanasal sinusesPneumothoraxNasal cavitySalivary glandMediastinumScintigraphyNuclear medicineThyroid carcinomaIn patientRadiation therapyEffective diffusion coefficientMedicineArea under the curve
22Publications
5H-index
84Citations
Publications 22
Newest
#1Tomoyasu Tachibana (RMIT: RMIT University)
#2Tomoaki SasakiH-Index: 5
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#2Tomoaki Sasaki (RMIT: RMIT University)H-Index: 5
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The aim of this study is to evaluate how metallic artifacts in the lumbar spine can affect images obtained from magnetic resonance (MR) sequences. We performed a phantom experiment by scanning an agar containing an orthopedic metallic implant using 64-channel multidetector row computed tomography (CT) and a 3-tesla MR unit. We compared the reproducibility in each measurement, enlargement or reduction ratio of the CT and MR measurements, and signal deviation in each voxel from the control. The re...
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#1Tomoaki Sasaki (RMIT: RMIT University)H-Index: 5
#1Tomoaki Sasaki (RMIT: RMIT University)
Last. Atsutaka Okizaki (Asahikawa Medical University)H-Index: 3
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Abstract Mucopolysaccharidosis type 2 is a congenital lysosomal disease characterized by iduronate-2-sulfatase deficiency, which leads to excessive accumulation of glycosaminoglycans in tissue. Dysostosis, which primarily involves decreased bone mineralization with morphological changes in the bone, is a major skeletal condition in mucopolysaccharidosis, but its pathophysiology is not well known. Here, we report a case of mucopolysaccharidosis type 2 diagnosed at the age of 2 years with longitud...
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#1Tomoyasu TachibanaH-Index: 8
#2Tomoaki Sasaki (RMIT: RMIT University)H-Index: 5
Last. Yasuharu Sato (Okayama University)H-Index: 32
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Methotrexate-associated lymphoproliferative disorders (MTX-LPD) frequently involve the extranodal organs throughout the body. Among the extranodal occurrences of MTX-LPD, pulmonary involvement is most frequent. In contrast, there are only a few reports of MTX-LPD in the nasal cavity or paranasal sinuses. Moreover, there are no previous reports of MTX-LPD mimicking granulomatosis with polyangiitis (GPA) in imaging examinations. We describe a case of a 53-year-old woman with MTX-LPD mimicking GPA ...
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#1Mariko Sato (UI: University of Iowa)
#1Mariko Sato (UI: University of Iowa)H-Index: 7
Last. Sue O'Dorisio (UI: University of Iowa)
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#1Tomoaki SasakiH-Index: 5
#2Toshio Moritani (UM: University of Michigan)H-Index: 16
Last. Koji TakahashiH-Index: 5
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BACKGROUND AND PURPOSE: Diffusion-weighted imaging may aid in distinguishing aggressive chordoma from nonaggressive chordoma. This study explores the prognostic role of the apparent diffusion coefficient in chordomas. MATERIALS AND METHODS: Sixteen patients with residual or recurrent chordoma were divided postoperatively into those with an aggressive tumor, defined as a growing tumor having a doubling time of RESULTS: Seven patients died during a median follow-up of 48 months (range, 4–126 month...
5 CitationsSource
#1Tomoaki Sasaki (UI: University of Iowa)H-Index: 5
#2John Kim (UM: University of Michigan)H-Index: 37
Last. Koji Takahashi (Asahikawa Medical University)H-Index: 5
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Purpose To explore the utility of the apparent diffusion coefficient (ADC) and tumor volume to predict histological grade and prognosis in patients with choroid plexus tumors.
4 CitationsSource
#1Tomoaki Sasaki (Asahikawa Medical University)H-Index: 5
#2Yasuomi FujimotoH-Index: 2
Last. Koji Takahashi (Asahikawa Medical University)H-Index: 5
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: To determine the utility of low kilovoltage computed tomographic venography (CTV) for the detection of deep venous thrombus in the lower limbs.Twenty-one thrombi in 19 enrolled patients were investigated in this retrospective study. Patients were initially scanned using CTV at 100 kVp, at the femur level, followed by an immediate switch to 80 kVp. We assessed the CT values of thrombi and veins and performed subjective evaluation for detecting thrombi using a 5-point scoring system: 1, unable t...
3 CitationsSource
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#1Tomoaki Sasaki (Asahikawa Medical University)H-Index: 5
#2Koji Takahashi (Asahikawa Medical University)H-Index: 5
Last. Makoto Obara (Philips)H-Index: 21
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PURPOSE: To assess the viability of oxygen-enhanced ventilation images using ultra-short echo time magnetic resonance imaging (UTE-MRI). METHODS: We evaluated the oxygen enhancement of the pulmonary T2*, and pulmonary signals in each TE (0.2, 0.8, 1.4, 2.0 ms) in 21 nonsmokers. RESULTS: The oxygen enhancement of pulmonary signals was the most significant (32%) at the 0.2 ms TE, the second in the pulmonary T2* (-18%). CONCLUSIONS: Pulmonary images using UTE-MRI are useful for ventilation imaging.
3 CitationsSource