dicomimageviewer: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/dicomimageviewer - from package: pixelmed-apps
/usr/bin/dicomimageviewer - from package: pixelmed-webstart-apps

You may install the required package with command apt-get install {package}

Error in other languages:
dicomimageviewer: bevel nie gevind nie
dicomimageviewer: comandă negăsită
dicomimageviewer: comando não encontrado
dicomimageviewer: commande introuvable
dicomimageviewer: command not found
dicomimageviewer: käsku ei ole
dicomimageviewer: không tìm thấy lệnh
dicomimageviewer: komanda nerasta
dicomimageviewer: Kommando nicht gefunden.
dicomimageviewer: kommandot finns inte
dicomimageviewer: komut yok
dicomimageviewer: nie znaleziono polecenia
dicomimageviewer: níor aimsíodh an t-ordú
dicomimageviewer: no se encontró la orden
dicomimageviewer: no s'ha trobat l'ordre
dicomimageviewer: opdracht niet gevonden
dicomimageviewer: parancs nem található
dicomimageviewer: perintah tidak ditemukan
dicomimageviewer: príkaz nenájdený
dicomimageviewer: příkaz nenalezen
dicomimageviewer: команда не найдена
dicomimageviewer: командата не е открита
dicomimageviewer: 命令找不到
dicomimageviewer: コマンドが見つかりません