dicomtodicom: 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/dicomtodicom - from package: vtk-dicom-tools

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

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