As with plain radiography and arthrography, CT employs ionizing radiat terjemahan - As with plain radiography and arthrography, CT employs ionizing radiat Bahasa Indonesia Bagaimana mengatakan

As with plain radiography and arthr

As with plain radiography and arthrography, CT employs ionizing radiation. It allows three-dimensional visualization of the carpal bones and provides soft tissue detail. Helical CT, also known as spiral CT, is a form of three-dimensional imaging that also uses ionizing radiation. Its major advantage over conventional CT is the rapidity with which it can image large areas. However, relative to conventional CT, spiral CT produces an image which is less sharp. Because the wrist and hand have relatively small anatomic areas and because a high degree of detail is required for accurate assessment, conventional CT is often more practical than spiral CT for evaluation of wrist/hand trauma.[17]

As in other anatomic regions, transaxial CT imaging of one or both wrists may be performed. Images are obtained while the patient is prone and with arm(s) stretched above the head. Because of the size and flexibility of the wrist, it is possible to obtain direct scans of the wrist in the coronal and sagittal planes. (CT scans acquired directly are sharper than reconstructed images and therefore easier to interpret.) With the patient prone, the elbow in 90[infinity] of flexion above the patient's head, and the palm face down on the CT table, direct sagittal scans may be acquired through the symptomatic wrist. If the patient's palm is rotated 90[infinity] to face the patient's head, direct coronal scans of the symptomatic wrist may be acquired. Last, in the trauma setting, CT images may be acquired in one additional plane, specially designed to assess the scaphoid. Images obtained in the sagittal oblique plane are taken along the long axis of the scaphoid. The scan is performed with the ulnarly-deviated wrist prone against the table.

In current clinical practice, wrist CT is most often requested in assessing nonunion of fractures, particularly a scaphoid waist fracture (Fig. 16). Less frequently, CT is utilized to better define a previously detected fracture or to assess the distal radioulnar joint for subluxation or dislocation
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As with plain radiography and arthrography, CT employs ionizing radiation. It allows three-dimensional visualization of the carpal bones and provides soft tissue detail. Helical CT, also known as spiral CT, is a form of three-dimensional imaging that also uses ionizing radiation. Its major advantage over conventional CT is the rapidity with which it can image large areas. However, relative to conventional CT, spiral CT produces an image which is less sharp. Because the wrist and hand have relatively small anatomic areas and because a high degree of detail is required for accurate assessment, conventional CT is often more practical than spiral CT for evaluation of wrist/hand trauma.[17]

As in other anatomic regions, transaxial CT imaging of one or both wrists may be performed. Images are obtained while the patient is prone and with arm(s) stretched above the head. Because of the size and flexibility of the wrist, it is possible to obtain direct scans of the wrist in the coronal and sagittal planes. (CT scans acquired directly are sharper than reconstructed images and therefore easier to interpret.) With the patient prone, the elbow in 90[infinity] of flexion above the patient's head, and the palm face down on the CT table, direct sagittal scans may be acquired through the symptomatic wrist. If the patient's palm is rotated 90[infinity] to face the patient's head, direct coronal scans of the symptomatic wrist may be acquired. Last, in the trauma setting, CT images may be acquired in one additional plane, specially designed to assess the scaphoid. Images obtained in the sagittal oblique plane are taken along the long axis of the scaphoid. The scan is performed with the ulnarly-deviated wrist prone against the table.

In current clinical practice, wrist CT is most often requested in assessing nonunion of fractures, particularly a scaphoid waist fracture (Fig. 16). Less frequently, CT is utilized to better define a previously detected fracture or to assess the distal radioulnar joint for subluxation or dislocation
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Seperti radiografi polos dan arthrography, CT mempekerjakan radiasi pengion. Hal ini memungkinkan visualisasi tiga dimensi dari tulang karpal dan memberikan detil jaringan lunak. Helical CT, juga dikenal sebagai spiral CT, merupakan bentuk pencitraan tiga dimensi yang juga menggunakan radiasi pengion. Keuntungan utama lebih CT konvensional adalah kecepatan dengan yang dapat daerah yang luas gambar. Namun, relatif terhadap CT konvensional, spiral CT menghasilkan gambar yang kurang tajam. Karena pergelangan tangan dan tangan memiliki area anatomi relatif kecil dan karena tingkat tinggi detail diperlukan untuk penilaian yang akurat, CT konvensional seringkali lebih praktis daripada CT spiral untuk evaluasi trauma pergelangan / tangan. [17] Seperti di daerah anatomi lainnya, transaxial CT pencitraan salah satu atau kedua pergelangan tangan dapat dilakukan. Gambar yang diperoleh saat pasien rentan dan dengan lengan (s) membentang di atas kepala. Karena ukuran dan fleksibilitas pergelangan tangan, adalah mungkin untuk mendapatkan scan langsung dari pergelangan tangan dalam bidang koronal dan sagital. (CT scan yang diperoleh langsung yang lebih tajam dari gambar direkonstruksi dan karena itu lebih mudah untuk menafsirkan.) Dengan pasien rentan, siku di 90 [infinity] fleksi di atas kepala pasien, dan telapak menghadap ke bawah di atas meja CT, scan sagital langsung dapat diperoleh melalui pergelangan gejala. Jika telapak tangan pasien diputar 90 [infinity] untuk menghadapi kepala pasien, scan koronal langsung dari pergelangan gejala dapat diperoleh. Terakhir, dalam pengaturan trauma, CT gambar dapat diperoleh dalam satu pesawat tambahan, khusus dirancang untuk menilai skafoid tersebut. Gambar yang diperoleh pada bidang miring sagital diambil sepanjang sumbu panjang skafoid tersebut. Scan ini dilakukan dengan pergelangan tangan ulnarly-menyimpang rawan terhadap meja. Dalam praktek klinis saat ini, pergelangan tangan CT yang paling sering diminta dalam menilai nonunion patah tulang, terutama patah tulang pinggang skafoid (Gbr. 16). Kurang sering, CT digunakan untuk lebih mendefinisikan fraktur terdeteksi sebelumnya atau untuk menilai radioulnar distal bersama untuk subluksasi atau dislokasi



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